Attachment 371173 Details for Bug 198471 – Patch

[patch] Patch

bug-198471-20190602174928.patch (text/plain), 82.11 KB, created by Darin Adler on 2019-06-02 17:49:29 PDT

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Creator: Darin Adler

Created: 2019-06-02 17:49:29 PDT

Size: 82.11 KB

patch

obsolete

>Subversion Revision: 246024
>diff --git a/Source/JavaScriptCore/ChangeLog b/Source/JavaScriptCore/ChangeLog
>index 25a5e395b767924300436dbec9e1fea6732c4a28..8224d7923869b9e8d7644eafab59ce2550786013 100644
>--- a/Source/JavaScriptCore/ChangeLog
>+++ b/Source/JavaScriptCore/ChangeLog
>@@ -1,3 +1,30 @@
>+2019-06-02  Darin Adler  <darin@apple.com>
>+
>+        Finish cleanup of String::number for floating point
>+        https://bugs.webkit.org/show_bug.cgi?id=198471
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * dfg/DFGStrengthReductionPhase.cpp:
>+        (JSC::DFG::StrengthReductionPhase::handleNode): Use String::number instead of
>+        String::numberToStringECMAScript, since that's now the default.
>+        * parser/ParserArena.h:
>+        (JSC::IdentifierArena::makeNumericIdentifier): Ditto.
>+        * runtime/JSONObject.cpp:
>+        (JSC::Stringifier::appendStringifiedValue): Use appendNumber instead of
>+        builder.appendECMAScriptNumber, since that's now the default.
>+        * runtime/NumberPrototype.cpp:
>+        (JSC::toStringWithRadix): Use String::number instead of
>+        String::numberToStringECMAScript, since that's now the default.
>+        (JSC::numberProtoFuncToExponential): Ditto.
>+        (JSC::numberProtoFuncToFixed): Ditto.
>+        (JSC::numberProtoFuncToPrecision): Ditto.
>+        (JSC::numberToStringInternal): Ditto.
>+        * runtime/NumericStrings.h:
>+        (JSC::NumericStrings::add): Ditto.
>+        * wasm/WasmBBQPlan.cpp:
>+        (JSC::Wasm::BBQPlan::prepare): Ditto.
>+
> 2019-06-02  Yusuke Suzuki  <ysuzuki@apple.com>
> 
>         [JSC] Crash explicitly if StructureIDs are exhausted
>diff --git a/Source/WTF/ChangeLog b/Source/WTF/ChangeLog
>index 8346686d812436086a9715954b82e7906cdbe172..058e527776748b7774b67099689d348c6cd894bc 100644
>--- a/Source/WTF/ChangeLog
>+++ b/Source/WTF/ChangeLog
>@@ -1,3 +1,24 @@
>+2019-06-02  Darin Adler  <darin@apple.com>
>+
>+        Finish cleanup of String::number for floating point
>+        https://bugs.webkit.org/show_bug.cgi?id=198471
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * wtf/JSONValues.cpp:
>+        (WTF::JSONImpl::Value::writeJSON const): Use appendNumber instead of
>+        appendECMAScriptNumber, since that's now the default.
>+
>+        * wtf/text/StringBuilder.cpp:
>+        (WTF::StringBuilder::appendNumber): Renamed from appendShortestFormNumber.
>+        * wtf/text/StringBuilder.h: Removed appendShortestFormNumber and
>+        appendECMAScriptNumber, replacing both with overload of appendNumber.
>+
>+        * wtf/text/WTFString.cpp:
>+        (WTF::String::number): Renamed from numberToStringShortest.
>+        * wtf/text/WTFString.h: Removed numberToStringShortest and
>+        numberToStringECMAScript, replacing both with overload of number.
>+
> 2019-06-02  Keith Miller  <keith_miller@apple.com>
> 
>         Reenable Gigacage on ARM64.
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index 196d2609c9e3d7207ffa92d1da2ea763f36a2105..82d901e2d0d1063a6ef33656d73d490dd888a2f8 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,57 @@
>+2019-06-02  Darin Adler  <darin@apple.com>
>+
>+        Finish cleanup of String::number for floating point
>+        https://bugs.webkit.org/show_bug.cgi?id=198471
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * css/CSSCursorImageValue.cpp:
>+        (WebCore::CSSCursorImageValue::customCSSText const): Use makeString instead
>+        of StringBuilder since it is more terse and possibly more efficient as well.
>+        * css/DOMMatrixReadOnly.cpp:
>+        (WebCore::DOMMatrixReadOnly::toString const): Ditto.
>+        * css/WebKitCSSMatrix.cpp:
>+        (WebCore::WebKitCSSMatrix::toString const): Ditto.
>+
>+        * html/parser/HTMLParserIdioms.cpp:
>+        (WebCore::serializeForNumberType): Use String::number instead of
>+        String::numberToStringECMAScript since that is now the default.
>+        * html/shadow/MediaControlElementTypes.cpp:
>+        (WebCore::MediaControlVolumeSliderElement::setVolume): Ditto.
>+        * html/shadow/MediaControlElements.cpp:
>+        (WebCore::MediaControlTimelineElement::setPosition): Ditto.
>+        * platform/Decimal.cpp:
>+        (WebCore::Decimal::fromDouble): Ditto.
>+
>+        * rendering/RenderListMarker.cpp:
>+        (WebCore::toRoman): Return a String instead of taking a StringBuilder argument.
>+        Use LetterCase enum instead of bool for the uppercase vs. lowercase argument, to
>+        be less mysterious at call sites. Use unsigned for string lengths since that's
>+        what WTF::String uses.
>+        (WebCore::toAlphabeticOrNumeric): Ditto. Also updated since SequenceType is now
>+        an enum class.
>+        (WebCore::toSymbolic): Use String::createUninitialized instead of StringBuilder.
>+        Return a String instead of taking a StringBuilder argument. Straighten out the
>+        algorithm so it's easier to understand.
>+        (WebCore::toAlphabetic): Updated since SequenceType is now an enum class.
>+        (WebCore::toNumeric): Ditto.
>+        (WebCore::toHebrew): Return a String instead of taking a StringBuilder argument.
>+        Use unsigned for string lengths since that's what WTF::String uses.
>+        (WebCore::toArmenianUnder10000): Use unsigned and the LetterCase enum class.
>+        (WebCore::toArmenian): Return a String instead of taking a StringBuilder argument.
>+        Also use unsigned for string lengths since that's what WTF::String uses.
>+        (WebCore::toGeorgian): Ditto.
>+        (WebCore::toCJKIdeographic): Ditto.
>+        (WebCore::listMarkerSuffix): Tweaked a comment.
>+        (WebCore::listMarkerText): Use String return values instead of StringBuilder.
>+        (WebCore::RenderListMarker::paint): Use String::createUninitialized instead of
>+        StringBuilder since it's a bit more efficient. Use makeString instead of turning
>+        single characters into strings since that's more efficient.
>+
>+        * svg/SVGPathUtilities.cpp:
>+        (WebCore::buildStringFromPath): Use appendNumber instead of appendShortestFormNumber
>+        since that is now the default.
>+
> 2019-06-01  Simon Fraser  <simon.fraser@apple.com>
> 
>         [Async overflow scroll] Flashing content when scrolling async overflow with a negative z-index child
>diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
>index 0ae2a31e86e4d05aafbe15edb3e6a522e0ed3b6c..e9d5c32eb5939c0d55eb850f453a4d3255249a69 100644
>--- a/Source/WebKit/ChangeLog
>+++ b/Source/WebKit/ChangeLog
>@@ -1,3 +1,18 @@
>+2019-06-02  Darin Adler  <darin@apple.com>
>+
>+        Finish cleanup of String::number for floating point
>+        https://bugs.webkit.org/show_bug.cgi?id=198471
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * NetworkProcess/Classifier/WebResourceLoadStatisticsTelemetry.cpp:
>+        (WebKit::submitTopList): Use makeString instead of StringBuilder since it
>+        is more terse and possibly more efficient as well.
>+        * UIProcess/API/APIUserScript.cpp:
>+        (API::UserScript::generateUniqueURL): Ditto.
>+        * UIProcess/API/APIUserStyleSheet.cpp:
>+        (API::UserStyleSheet::generateUniqueURL): Ditto.
>+
> 2019-06-01  Dean Jackson  <dino@apple.com>
> 
>         Provide an action to save an image on a link sheet
>diff --git a/Source/JavaScriptCore/dfg/DFGStrengthReductionPhase.cpp b/Source/JavaScriptCore/dfg/DFGStrengthReductionPhase.cpp
>index c7fd52a8eb9755ad1b1b29957f13f4bbe16c48c1..d1cde134133ec302f94f4fac8f12c71c7839fd94 100644
>--- a/Source/JavaScriptCore/dfg/DFGStrengthReductionPhase.cpp
>+++ b/Source/JavaScriptCore/dfg/DFGStrengthReductionPhase.cpp
>@@ -350,7 +350,7 @@ private:
>                     if (value.isInt32())
>                         return String::number(value.asInt32());
>                     if (value.isNumber())
>-                        return String::numberToStringECMAScript(value.asNumber());
>+                        return String::number(value.asNumber());
>                     if (value.isBoolean())
>                         return value.asBoolean() ? "true"_s : "false"_s;
>                     if (value.isNull())
>@@ -421,7 +421,7 @@ private:
>                         if (value.isInt32())
>                             result = String::number(value.asInt32());
>                         else if (value.isNumber())
>-                            result = String::numberToStringECMAScript(value.asNumber());
>+                            result = String::number(value.asNumber());
> 
>                         if (!result.isNull()) {
>                             convertToLazyJSValue(m_node, LazyJSValue::newString(m_graph, result));
>diff --git a/Source/JavaScriptCore/parser/ParserArena.h b/Source/JavaScriptCore/parser/ParserArena.h
>index 67b782dd3dc6cb52c178f336df338a726d986969..df17be53663e7cb7b70c48770f9a0529cf33a7ee 100644
>--- a/Source/JavaScriptCore/parser/ParserArena.h
>+++ b/Source/JavaScriptCore/parser/ParserArena.h
>@@ -130,7 +130,9 @@ namespace JSC {
>     
>     inline const Identifier& IdentifierArena::makeNumericIdentifier(VM* vm, double number)
>     {
>-        m_identifiers.append(Identifier::fromString(vm, String::numberToStringECMAScript(number)));
>+        // FIXME: Why doesn't this use the Identifier::from overload that takes a double?
>+        // Seems we are missing out on multiple optimizations by not using it.
>+        m_identifiers.append(Identifier::fromString(vm, String::number(number)));
>         return m_identifiers.last();
>     }
> 
>diff --git a/Source/JavaScriptCore/runtime/JSONObject.cpp b/Source/JavaScriptCore/runtime/JSONObject.cpp
>index dd12bd36a7203a2372f91a194ec4551a7b75735c..97c10451c831297f6df3dfbe55322ed7cfb131cd 100644
>--- a/Source/JavaScriptCore/runtime/JSONObject.cpp
>+++ b/Source/JavaScriptCore/runtime/JSONObject.cpp
>@@ -377,7 +377,7 @@ Stringifier::StringifyResult Stringifier::appendStringifiedValue(StringBuilder&
>             if (!std::isfinite(number))
>                 builder.appendLiteral("null");
>             else
>-                builder.appendECMAScriptNumber(number);
>+                builder.appendNumber(number);
>         }
>         return StringifySucceeded;
>     }
>diff --git a/Source/JavaScriptCore/runtime/NumberPrototype.cpp b/Source/JavaScriptCore/runtime/NumberPrototype.cpp
>index ab3afd003bb36f0c1d6aed63acdc356647c729c6..f69e68b8ef5d1b4ca133d567ebefc9967a1ef0e5 100644
>--- a/Source/JavaScriptCore/runtime/NumberPrototype.cpp
>+++ b/Source/JavaScriptCore/runtime/NumberPrototype.cpp
>@@ -395,7 +395,7 @@ String toStringWithRadix(double doubleValue, int32_t radix)
>         return toStringWithRadixInternal(integerValue, radix);
> 
>     if (radix == 10 || !std::isfinite(doubleValue))
>-        return String::numberToStringECMAScript(doubleValue);
>+        return String::number(doubleValue);
> 
>     RadixBuffer buffer;
>     return toStringWithRadixInternal(buffer, doubleValue, radix);
>@@ -422,7 +422,7 @@ EncodedJSValue JSC_HOST_CALL numberProtoFuncToExponential(ExecState* exec)
> 
>     // Handle NaN and Infinity.
>     if (!std::isfinite(x))
>-        return JSValue::encode(jsNontrivialString(exec, String::numberToStringECMAScript(x)));
>+        return JSValue::encode(jsNontrivialString(exec, String::number(x)));
> 
>     if (!inRange)
>         return throwVMError(exec, scope, createRangeError(exec, "toExponential() argument must be between 0 and 20"_s));
>@@ -463,7 +463,7 @@ EncodedJSValue JSC_HOST_CALL numberProtoFuncToFixed(ExecState* exec)
>     // This also covers Ininity, and structure the check so that NaN
>     // values are also handled by numberToString
>     if (!(fabs(x) < 1e+21))
>-        return JSValue::encode(jsString(exec, String::numberToStringECMAScript(x)));
>+        return JSValue::encode(jsString(exec, String::number(x)));
> 
>     // The check above will return false for NaN or Infinity, these will be
>     // handled by numberToString.
>@@ -496,11 +496,11 @@ EncodedJSValue JSC_HOST_CALL numberProtoFuncToPrecision(ExecState* exec)
> 
>     // To precision called with no argument is treated as ToString.
>     if (isUndefined)
>-        return JSValue::encode(jsString(exec, String::numberToStringECMAScript(x)));
>+        return JSValue::encode(jsString(exec, String::number(x)));
> 
>     // Handle NaN and Infinity.
>     if (!std::isfinite(x))
>-        return JSValue::encode(jsNontrivialString(exec, String::numberToStringECMAScript(x)));
>+        return JSValue::encode(jsNontrivialString(exec, String::number(x)));
> 
>     if (!inRange)
>         return throwVMError(exec, scope, createRangeError(exec, "toPrecision() argument must be between 1 and 21"_s));
>@@ -537,7 +537,7 @@ static ALWAYS_INLINE JSString* numberToStringInternal(VM& vm, double doubleValue
>         return jsString(&vm, vm.numericStrings.add(doubleValue));
> 
>     if (!std::isfinite(doubleValue))
>-        return jsNontrivialString(&vm, String::numberToStringECMAScript(doubleValue));
>+        return jsNontrivialString(&vm, String::number(doubleValue));
> 
>     RadixBuffer buffer;
>     return jsString(&vm, toStringWithRadixInternal(buffer, doubleValue, radix));
>diff --git a/Source/JavaScriptCore/runtime/NumericStrings.h b/Source/JavaScriptCore/runtime/NumericStrings.h
>index 86c5c3823f9c8c00e7eed002f64233390ec903c8..ca93f47b7972ceeb51fb8d1ffcdf6921e2305b5d 100644
>--- a/Source/JavaScriptCore/runtime/NumericStrings.h
>+++ b/Source/JavaScriptCore/runtime/NumericStrings.h
>@@ -39,7 +39,7 @@ public:
>         if (d == entry.key && !entry.value.isNull())
>             return entry.value;
>         entry.key = d;
>-        entry.value = String::numberToStringECMAScript(d);
>+        entry.value = String::number(d);
>         return entry.value;
>     }
> 
>diff --git a/Source/JavaScriptCore/wasm/WasmBBQPlan.cpp b/Source/JavaScriptCore/wasm/WasmBBQPlan.cpp
>index fe09d3300e4d34523e445c0a91e98044b806fe07..0b38f9d596bfc07bcb672bc2a17b71aadc1c49aa 100644
>--- a/Source/JavaScriptCore/wasm/WasmBBQPlan.cpp
>+++ b/Source/JavaScriptCore/wasm/WasmBBQPlan.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2019 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -45,7 +45,7 @@
> #include <wtf/MonotonicTime.h>
> #include <wtf/StdLibExtras.h>
> #include <wtf/SystemTracing.h>
>-#include <wtf/text/StringBuilder.h>
>+#include <wtf/text/StringConcatenateNumbers.h>
> 
> namespace JSC { namespace Wasm {
> 
>@@ -151,11 +151,7 @@ void BBQPlan::prepare()
> 
>     auto tryReserveCapacity = [this] (auto& vector, size_t size, const char* what) {
>         if (UNLIKELY(!vector.tryReserveCapacity(size))) {
>-            StringBuilder builder;
>-            builder.appendLiteral("Failed allocating enough space for ");
>-            builder.appendNumber(size);
>-            builder.append(what);
>-            fail(holdLock(m_lock), builder.toString());
>+            fail(holdLock(m_lock), WTF::makeString("Failed allocating enough space for ", size, what));
>             return false;
>         }
>         return true;
>diff --git a/Source/WTF/wtf/JSONValues.cpp b/Source/WTF/wtf/JSONValues.cpp
>index 829acca997ccded03d6149e24f9c6cec357eaef9..8681a88e4862070f5db34f202d0dea820567caf3 100644
>--- a/Source/WTF/wtf/JSONValues.cpp
>+++ b/Source/WTF/wtf/JSONValues.cpp
>@@ -680,7 +680,7 @@ void Value::writeJSON(StringBuilder& output) const
>         if (!std::isfinite(m_value.number))
>             output.appendLiteral("null");
>         else
>-            output.appendECMAScriptNumber(m_value.number);
>+            output.appendNumber(m_value.number);
>         break;
>     }
>     default:
>diff --git a/Source/WTF/wtf/text/StringBuilder.cpp b/Source/WTF/wtf/text/StringBuilder.cpp
>index e3d3542287a42e94c9a3c77acf6ff551c6644637..da1d4a4c1dc9c946d3314e0e6de1e813d1031373 100644
>--- a/Source/WTF/wtf/text/StringBuilder.cpp
>+++ b/Source/WTF/wtf/text/StringBuilder.cpp
>@@ -415,13 +415,13 @@ void StringBuilder::appendFixedPrecisionNumber(double number, unsigned precision
>     append(numberToFixedPrecisionString(number, precision, buffer, policy == TruncateTrailingZeros));
> }
> 
>-void StringBuilder::appendShortestFormNumber(float number)
>+void StringBuilder::appendNumber(float number)
> {
>     NumberToStringBuffer buffer;
>     append(numberToString(number, buffer));
> }
> 
>-void StringBuilder::appendShortestFormNumber(double number)
>+void StringBuilder::appendNumber(double number)
> {
>     NumberToStringBuffer buffer;
>     append(numberToString(number, buffer));
>diff --git a/Source/WTF/wtf/text/StringBuilder.h b/Source/WTF/wtf/text/StringBuilder.h
>index ebaf73e6ef790c8269ab9a012d425488c57b1e11..fe4c5320ceb3f1d28a04f59283996b92bbc1e51e 100644
>--- a/Source/WTF/wtf/text/StringBuilder.h
>+++ b/Source/WTF/wtf/text/StringBuilder.h
>@@ -222,21 +222,14 @@ public:
>     WTF_EXPORT_PRIVATE void appendNumber(unsigned long);
>     WTF_EXPORT_PRIVATE void appendNumber(long long);
>     WTF_EXPORT_PRIVATE void appendNumber(unsigned long long);
>-    // FIXME: Change to call appendShortestFormNumber.
>-    void appendNumber(float) = delete;
>-    void appendNumber(double) = delete;
>+    WTF_EXPORT_PRIVATE void appendNumber(float);
>+    WTF_EXPORT_PRIVATE void appendNumber(double);
> 
>-    WTF_EXPORT_PRIVATE void appendShortestFormNumber(float);
>-    WTF_EXPORT_PRIVATE void appendShortestFormNumber(double);
>     WTF_EXPORT_PRIVATE void appendFixedPrecisionNumber(float, unsigned precision = 6, TrailingZerosTruncatingPolicy = TruncateTrailingZeros);
>     WTF_EXPORT_PRIVATE void appendFixedPrecisionNumber(double, unsigned precision = 6, TrailingZerosTruncatingPolicy = TruncateTrailingZeros);
>     WTF_EXPORT_PRIVATE void appendFixedWidthNumber(float, unsigned decimalPlaces);
>     WTF_EXPORT_PRIVATE void appendFixedWidthNumber(double, unsigned decimalPlaces);
> 
>-    // FIXME: Delete in favor of the name appendShortestFormNumber or just appendNumber.
>-    void appendECMAScriptNumber(float) = delete;
>-    void appendECMAScriptNumber(double);
>-
>     String toString()
>     {
>         if (!m_string.isNull()) {
>@@ -394,11 +387,6 @@ ALWAYS_INLINE UChar* StringBuilder::getBufferCharacters<UChar>()
>     return m_bufferCharacters16;
> }
> 
>-inline void StringBuilder::appendECMAScriptNumber(double number)
>-{
>-    appendShortestFormNumber(number);
>-}
>-
> template <typename CharType>
> bool equal(const StringBuilder& s, const CharType* buffer, unsigned length)
> {
>diff --git a/Source/WTF/wtf/text/WTFString.cpp b/Source/WTF/wtf/text/WTFString.cpp
>index f5acba8374cba236f86eec5e7b7400b6bb6bb360..e5c18fe4c36f59d97203d9270f6f2a208b1e2764 100644
>--- a/Source/WTF/wtf/text/WTFString.cpp
>+++ b/Source/WTF/wtf/text/WTFString.cpp
>@@ -491,13 +491,13 @@ String String::numberToStringFixedPrecision(double number, unsigned precision, T
>     return numberToFixedPrecisionString(number, precision, buffer, trailingZerosTruncatingPolicy == TruncateTrailingZeros);
> }
> 
>-String String::numberToStringShortest(float number)
>+String String::number(float number)
> {
>     NumberToStringBuffer buffer;
>     return numberToString(number, buffer);
> }
> 
>-String String::numberToStringShortest(double number)
>+String String::number(double number)
> {
>     NumberToStringBuffer buffer;
>     return numberToString(number, buffer);
>diff --git a/Source/WTF/wtf/text/WTFString.h b/Source/WTF/wtf/text/WTFString.h
>index 007ac572d6be07b1fd85b9ddc353a59fe7d17472..9a753adb6123da4c4f1eb8fab9912e146d37b363 100644
>--- a/Source/WTF/wtf/text/WTFString.h
>+++ b/Source/WTF/wtf/text/WTFString.h
>@@ -124,12 +124,10 @@ public:
>     WTF_EXPORT_PRIVATE String(ASCIILiteral);
> 
>     // Construct a string from a constant string literal.
>-    // This constructor is the "big" version, as it put the length in the function call and generate bigger code.
>+    // This is the "big" version: puts the length in the function call and generates bigger code.
>     enum ConstructFromLiteralTag { ConstructFromLiteral };
>     template<unsigned characterCount> String(const char (&characters)[characterCount], ConstructFromLiteralTag) : m_impl(StringImpl::createFromLiteral<characterCount>(characters)) { }
> 
>-    // FIXME: Why do we have to define these explicitly given that we just want the default versions?
>-    // We have verified empirically that we do.
>     String(const String&) = default;
>     String(String&&) = default;
>     String& operator=(const String&) = default;
>@@ -179,21 +177,14 @@ public:
>     WTF_EXPORT_PRIVATE static String number(unsigned long);
>     WTF_EXPORT_PRIVATE static String number(long long);
>     WTF_EXPORT_PRIVATE static String number(unsigned long long);
>-    // FIXME: Change to call numberToStringShortest.
>-    static String number(float) = delete;
>-    static String number(double) = delete;
>+    WTF_EXPORT_PRIVATE static String number(float);
>+    WTF_EXPORT_PRIVATE static String number(double);
> 
>-    WTF_EXPORT_PRIVATE static String numberToStringShortest(float);
>-    WTF_EXPORT_PRIVATE static String numberToStringShortest(double);
>     WTF_EXPORT_PRIVATE static String numberToStringFixedPrecision(float, unsigned precision = 6, TrailingZerosTruncatingPolicy = TruncateTrailingZeros);
>     WTF_EXPORT_PRIVATE static String numberToStringFixedPrecision(double, unsigned precision = 6, TrailingZerosTruncatingPolicy = TruncateTrailingZeros);
>     WTF_EXPORT_PRIVATE static String numberToStringFixedWidth(float, unsigned decimalPlaces);
>     WTF_EXPORT_PRIVATE static String numberToStringFixedWidth(double, unsigned decimalPlaces);
> 
>-    // FIXME: Delete in favor of the name numberToStringShortest or just number.
>-    static String numberToStringECMAScript(float) = delete;
>-    static String numberToStringECMAScript(double);
>-
>     // Find a single character or string, also with match function & latin1 forms.
>     size_t find(UChar character, unsigned start = 0) const { return m_impl ? m_impl->find(character, start) : notFound; }
> 
>@@ -654,11 +645,6 @@ template<unsigned length> inline bool startsWithLettersIgnoringASCIICase(const S
>     return startsWithLettersIgnoringASCIICase(string.impl(), lowercaseLetters);
> }
> 
>-inline String String::numberToStringECMAScript(double number)
>-{
>-    return numberToStringShortest(number);
>-}
>-
> inline namespace StringLiterals {
> 
> inline String operator"" _str(const char* characters, size_t)
>diff --git a/Source/WebCore/css/CSSCursorImageValue.cpp b/Source/WebCore/css/CSSCursorImageValue.cpp
>index 33a529e81266073135693e0d747d5d12e9de1602..f157aafd4ced81e43173689d17d8831ca161a171 100644
>--- a/Source/WebCore/css/CSSCursorImageValue.cpp
>+++ b/Source/WebCore/css/CSSCursorImageValue.cpp
>@@ -1,7 +1,7 @@
> /*
>  * Copyright (C) 2006 Rob Buis <buis@kde.org>
>  *           (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
>- * Copyright (C) 2008 Apple Inc. All rights reserved.
>+ * Copyright (C) 2008-2019 Apple Inc. All rights reserved.
>  *
>  * This library is free software; you can redistribute it and/or
>  * modify it under the terms of the GNU Library General Public
>@@ -54,15 +54,10 @@ CSSCursorImageValue::~CSSCursorImageValue()
> 
> String CSSCursorImageValue::customCSSText() const
> {
>-    StringBuilder result;
>-    result.append(m_imageValue.get().cssText());
>-    if (m_hasHotSpot) {
>-        result.append(' ');
>-        result.appendNumber(m_hotSpot.x());
>-        result.append(' ');
>-        result.appendNumber(m_hotSpot.y());
>-    }
>-    return result.toString();
>+    String text = m_imageValue.get().cssText();
>+    if (!m_hasHotSpot)
>+        return text;
>+    return makeString(text, ' ', m_hotSpot.x(), ' ', m_hotSpot.y());
> }
> 
> // FIXME: Should this function take a TreeScope instead?
>diff --git a/Source/WebCore/css/DOMMatrixReadOnly.cpp b/Source/WebCore/css/DOMMatrixReadOnly.cpp
>index 656641b7e19c5b3327196ef75aa7a0f3861e969e..5d8955da11fac92e30ae8ba50236909fcb11fdf7 100644
>--- a/Source/WebCore/css/DOMMatrixReadOnly.cpp
>+++ b/Source/WebCore/css/DOMMatrixReadOnly.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2017-2019 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -404,56 +404,10 @@ ExceptionOr<String> DOMMatrixReadOnly::toString() const
>     if (!m_matrix.containsOnlyFiniteValues())
>         return Exception { InvalidStateError, "Matrix contains non-finite values"_s };
> 
>-    StringBuilder builder;
>-    if (is2D()) {
>-        builder.appendLiteral("matrix(");
>-        builder.appendECMAScriptNumber(m_matrix.a());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.b());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.c());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.d());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.e());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.f());
>-    } else {
>-        builder.appendLiteral("matrix3d(");
>-        builder.appendECMAScriptNumber(m_matrix.m11());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m12());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m13());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m14());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m21());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m22());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m23());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m24());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m31());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m32());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m33());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m34());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m41());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m42());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m43());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m44());
>-    }
>-    builder.append(')');
>-    return builder.toString();
>+    if (is2D())
>+        return makeString("matrix(", m_matrix.a(), ", ", m_matrix.b(), ", ", m_matrix.c(), ", ", m_matrix.d(), ", ", m_matrix.e(), ", ", m_matrix.f(), ')');
>+
>+    return makeString("matrix3d(", m_matrix.m11(), ", ", m_matrix.m12(), ", ", m_matrix.m13(), ", ", m_matrix.m14(), ", ", m_matrix.m21(), ", ", m_matrix.m22(), ", ", m_matrix.m23(), ", ", m_matrix.m24(), ", ", m_matrix.m31(), ", ", m_matrix.m32(), ", ", m_matrix.m33(), ", ", m_matrix.m34(), ", ", m_matrix.m41(), ", ", m_matrix.m42(), ", ", m_matrix.m43(), ", ", m_matrix.m44(), ')');
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/css/WebKitCSSMatrix.cpp b/Source/WebCore/css/WebKitCSSMatrix.cpp
>index 2b301e95172373c5462ee0ed07e4900700e18afc..d3e86004b00026154a49e4d9a54ff778fb171762 100644
>--- a/Source/WebCore/css/WebKitCSSMatrix.cpp
>+++ b/Source/WebCore/css/WebKitCSSMatrix.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2008 Apple Inc. All Rights Reserved.
>+ * Copyright (C) 2008-2019 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -35,7 +35,7 @@
> #include "TransformFunctions.h"
> #include <wtf/IsoMallocInlines.h>
> #include <wtf/MathExtras.h>
>-#include <wtf/text/StringBuilder.h>
>+#include <wtf/text/StringConcatenateNumbers.h>
> 
> namespace WebCore {
> 
>@@ -203,56 +203,10 @@ ExceptionOr<String> WebKitCSSMatrix::toString() const
>     if (!m_matrix.containsOnlyFiniteValues())
>         return Exception { InvalidStateError, "Matrix contains non-finite values"_s };
> 
>-    StringBuilder builder;
>-    if (m_matrix.isAffine()) {
>-        builder.appendLiteral("matrix(");
>-        builder.appendECMAScriptNumber(m_matrix.a());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.b());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.c());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.d());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.e());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.f());
>-    } else {
>-        builder.appendLiteral("matrix3d(");
>-        builder.appendECMAScriptNumber(m_matrix.m11());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m12());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m13());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m14());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m21());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m22());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m23());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m24());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m31());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m32());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m33());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m34());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m41());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m42());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m43());
>-        builder.appendLiteral(", ");
>-        builder.appendECMAScriptNumber(m_matrix.m44());
>-    }
>-    builder.append(')');
>-    return builder.toString();
>+    if (m_matrix.isAffine())
>+        return makeString("matrix(", m_matrix.a(), ", ", m_matrix.b(), ", ", m_matrix.c(), ", ", m_matrix.d(), ", ", m_matrix.e(), ", ", m_matrix.f(), ')');
>+
>+    return makeString("matrix3d(", m_matrix.m11(), ", ", m_matrix.m12(), ", ", m_matrix.m13(), ", ", m_matrix.m14(), ", ", m_matrix.m21(), ", ", m_matrix.m22(), ", ", m_matrix.m23(), ", ", m_matrix.m24(), ", ", m_matrix.m31(), ", ", m_matrix.m32(), ", ", m_matrix.m33(), ", ", m_matrix.m34(), ", ", m_matrix.m41(), ", ", m_matrix.m42(), ", ", m_matrix.m43(), ", ", m_matrix.m44(), ')');
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/parser/HTMLParserIdioms.cpp b/Source/WebCore/html/parser/HTMLParserIdioms.cpp
>index 3991e754615dd130cfbfa59dd754fe977600592a..5442e0c4a067ba727b6295f9b918f3399db2eace 100644
>--- a/Source/WebCore/html/parser/HTMLParserIdioms.cpp
>+++ b/Source/WebCore/html/parser/HTMLParserIdioms.cpp
>@@ -89,7 +89,7 @@ String serializeForNumberType(double number)
> {
>     // According to HTML5, "the best representation of the number n as a floating
>     // point number" is a string produced by applying ToString() to n.
>-    return String::numberToStringECMAScript(number);
>+    return String::number(number);
> }
> 
> Decimal parseToDecimalForNumberType(const String& string, const Decimal& fallbackValue)
>diff --git a/Source/WebCore/html/shadow/MediaControlElementTypes.cpp b/Source/WebCore/html/shadow/MediaControlElementTypes.cpp
>index d2891a7e9d5e5e49fbeaec3af5889b66632e978d..26aaa153eae37ff84e5b1918ca938056f08b048f 100644
>--- a/Source/WebCore/html/shadow/MediaControlElementTypes.cpp
>+++ b/Source/WebCore/html/shadow/MediaControlElementTypes.cpp
>@@ -242,7 +242,7 @@ bool MediaControlVolumeSliderElement::willRespondToMouseClickEvents()
> void MediaControlVolumeSliderElement::setVolume(double volume)
> {
>     if (value().toDouble() != volume)
>-        setValue(String::numberToStringECMAScript(volume));
>+        setValue(String::number(volume));
> }
> 
> void MediaControlVolumeSliderElement::setClearMutedOnUserInteraction(bool clearMute)
>diff --git a/Source/WebCore/html/shadow/MediaControlElements.cpp b/Source/WebCore/html/shadow/MediaControlElements.cpp
>index 7fa4ab6da4ef78bea8134ee8340370cf0f3a46f5..089e139348362827bb5ed0437b6720ce61dfc996 100644
>--- a/Source/WebCore/html/shadow/MediaControlElements.cpp
>+++ b/Source/WebCore/html/shadow/MediaControlElements.cpp
>@@ -909,7 +909,7 @@ bool MediaControlTimelineElement::willRespondToMouseClickEvents()
> 
> void MediaControlTimelineElement::setPosition(double currentTime)
> {
>-    setValue(String::numberToStringECMAScript(currentTime));
>+    setValue(String::number(currentTime));
> }
> 
> void MediaControlTimelineElement::setDuration(double duration)
>diff --git a/Source/WebCore/platform/Decimal.cpp b/Source/WebCore/platform/Decimal.cpp
>index b1ac6592ef281a21cbb36c6e80a829dbcbaa3fbe..0b21104f9657ef9d032827db602123ad879f4c21 100644
>--- a/Source/WebCore/platform/Decimal.cpp
>+++ b/Source/WebCore/platform/Decimal.cpp
>@@ -681,8 +681,11 @@ Decimal Decimal::floor() const
> 
> Decimal Decimal::fromDouble(double doubleValue)
> {
>-    if (std::isfinite(doubleValue))
>-        return fromString(String::numberToStringECMAScript(doubleValue));
>+    if (std::isfinite(doubleValue)) {
>+        // FIXME: Change fromString to take a StringView instead of a String and then
>+        // use a fixed size stack buffer instead of allocating and deallocating a string.
>+        return fromString(String::number(doubleValue));
>+    }
> 
>     if (std::isinf(doubleValue))
>         return infinity(doubleValue < 0 ? Negative : Positive);
>diff --git a/Source/WebCore/rendering/RenderListMarker.cpp b/Source/WebCore/rendering/RenderListMarker.cpp
>index 4f78f83105c96cc6bf81d73ef824459d644a9326..ce019baa3bd55a16ee24faee6e976626bcbeaed4 100644
>--- a/Source/WebCore/rendering/RenderListMarker.cpp
>+++ b/Source/WebCore/rendering/RenderListMarker.cpp
>@@ -1,7 +1,7 @@
> /*
>  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
>  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
>- * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
>+ * Copyright (C) 2003-2019 Apple Inc. All rights reserved.
>  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
>  * Copyright (C) 2010 Daniel Bates (dbates@intudata.com)
>  *
>@@ -34,7 +34,7 @@
> #include "RenderView.h"
> #include <wtf/IsoMallocInlines.h>
> #include <wtf/StackStats.h>
>-#include <wtf/text/StringBuilder.h>
>+#include <wtf/text/StringConcatenateNumbers.h>
> #include <wtf/unicode/CharacterNames.h>
> 
> namespace WebCore {
>@@ -45,9 +45,10 @@ WTF_MAKE_ISO_ALLOCATED_IMPL(RenderListMarker);
> 
> const int cMarkerPadding = 7;
> 
>-enum SequenceType { NumericSequence, AlphabeticSequence };
>+enum class LetterCase { Lower, Upper };
>+enum class SequenceType { Numeric, Alphabetic };
> 
>-static NEVER_INLINE void toRoman(StringBuilder& builder, int number, bool upper)
>+static NEVER_INLINE String toRoman(int number, LetterCase letterCase)
> {
>     // FIXME: CSS3 describes how to make this work for much larger numbers,
>     // using overbars and special characters. It also specifies the characters
>@@ -56,13 +57,13 @@ static NEVER_INLINE void toRoman(StringBuilder& builder, int number, bool upper)
> 
>     // Big enough to store largest roman number less than 3999 which
>     // is 3888 (MMMDCCCLXXXVIII)
>-    const int lettersSize = 15;
>+    constexpr unsigned lettersSize = 15;
>     LChar letters[lettersSize];
> 
>-    int length = 0;
>+    unsigned length = 0;
>     const LChar ldigits[] = { 'i', 'v', 'x', 'l', 'c', 'd', 'm' };
>     const LChar udigits[] = { 'I', 'V', 'X', 'L', 'C', 'D', 'M' };
>-    const LChar* digits = upper ? udigits : ldigits;
>+    const LChar* digits = letterCase == LetterCase::Upper ? udigits : ldigits;
>     int d = 0;
>     do {
>         int num = number % 10;
>@@ -80,22 +81,22 @@ static NEVER_INLINE void toRoman(StringBuilder& builder, int number, bool upper)
>     } while (number);
> 
>     ASSERT(length <= lettersSize);
>-    builder.append(&letters[lettersSize - length], length);
>+    return String { &letters[lettersSize - length], length };
> }
> 
>-template <typename CharacterType>
>-static inline void toAlphabeticOrNumeric(StringBuilder& builder, int number, const CharacterType* sequence, unsigned sequenceSize, SequenceType type)
>+template<typename CharacterType>
>+static inline String toAlphabeticOrNumeric(int number, const CharacterType* sequence, unsigned sequenceSize, SequenceType type)
> {
>     ASSERT(sequenceSize >= 2);
> 
>     // Taking sizeof(number) in the expression below doesn't work with some compilers.
>-    const int lettersSize = sizeof(int) * 8 + 1; // Binary is the worst case; requires one character per bit plus a minus sign.
>+    constexpr unsigned lettersSize = sizeof(int) * 8 + 1; // Binary is the worst case; requires one character per bit plus a minus sign.
> 
>     CharacterType letters[lettersSize];
> 
>     bool isNegativeNumber = false;
>     unsigned numberShadow = number;
>-    if (type == AlphabeticSequence) {
>+    if (type == SequenceType::Alphabetic) {
>         ASSERT(number > 0);
>         --numberShadow;
>     } else if (number < 0) {
>@@ -103,9 +104,9 @@ static inline void toAlphabeticOrNumeric(StringBuilder& builder, int number, con
>         isNegativeNumber = true;
>     }
>     letters[lettersSize - 1] = sequence[numberShadow % sequenceSize];
>-    int length = 1;
>+    unsigned length = 1;
> 
>-    if (type == AlphabeticSequence) {
>+    if (type == SequenceType::Alphabetic) {
>         while ((numberShadow /= sequenceSize) > 0) {
>             --numberShadow;
>             letters[lettersSize - ++length] = sequence[numberShadow % sequenceSize];
>@@ -118,52 +119,54 @@ static inline void toAlphabeticOrNumeric(StringBuilder& builder, int number, con
>         letters[lettersSize - ++length] = hyphenMinus;
> 
>     ASSERT(length <= lettersSize);
>-    builder.append(&letters[lettersSize - length], length);
>+    return String { &letters[lettersSize - length], length };
> }
> 
>-template <typename CharacterType>
>-static NEVER_INLINE void toSymbolic(StringBuilder& builder, int number, const CharacterType* symbols, unsigned symbolsSize)
>+template<typename CharacterType>
>+static NEVER_INLINE String toSymbolic(int number, const CharacterType* symbols, unsigned symbolsSize)
> {
>     ASSERT(number > 0);
>     ASSERT(symbolsSize >= 1);
>-    unsigned numberShadow = number;
>-    --numberShadow;
> 
>-    // The asterisks list-style-type is the worst case; we show |numberShadow| asterisks.
>-    builder.append(symbols[numberShadow % symbolsSize]);
>-    unsigned numSymbols = numberShadow / symbolsSize;
>-    while (numSymbols--)
>-        builder.append(symbols[numberShadow % symbolsSize]);
>+    // The asterisks list-style-type is the worst case; we show |number| asterisks.
>+    CharacterType symbol = symbols[(number - 1) % symbolsSize];
>+    unsigned count = (number - 1) / symbolsSize + 1;
>+
>+    CharacterType* characters;
>+    String result = String::createUninitialized(count, characters);
>+    for (unsigned i = 0; i < count; ++i)
>+        characters[i] = symbol;
>+    return result;
> }
> 
>-template <typename CharacterType>
>-static NEVER_INLINE void toAlphabetic(StringBuilder& builder, int number, const CharacterType* alphabet, unsigned alphabetSize)
>+template<typename CharacterType>
>+static NEVER_INLINE String toAlphabetic(int number, const CharacterType* alphabet, unsigned alphabetSize)
> {
>-    toAlphabeticOrNumeric(builder, number, alphabet, alphabetSize, AlphabeticSequence);
>+    return toAlphabeticOrNumeric(number, alphabet, alphabetSize, SequenceType::Alphabetic);
> }
> 
>-template <typename CharacterType>
>-static NEVER_INLINE void toNumeric(StringBuilder& builder, int number, const CharacterType* numerals, unsigned numeralsSize)
>+template<typename CharacterType>
>+static NEVER_INLINE String toNumeric(int number, const CharacterType* numerals, unsigned numeralsSize)
> {
>-    toAlphabeticOrNumeric(builder, number, numerals, numeralsSize, NumericSequence);
>+    return toAlphabeticOrNumeric(number, numerals, numeralsSize, SequenceType::Numeric);
> }
> 
>-template <typename CharacterType, size_t size>
>-static inline void toAlphabetic(StringBuilder& builder, int number, const CharacterType(&alphabet)[size])
>+template<typename CharacterType, size_t size>
>+static inline String toAlphabetic(int number, const CharacterType(&alphabet)[size])
> {
>-    toAlphabetic(builder, number, alphabet, size);
>+    return toAlphabetic(number, alphabet, size);
> }
> 
>-template <typename CharacterType, size_t size>
>-static inline void toNumeric(StringBuilder& builder, int number, const CharacterType(&alphabet)[size])
>+template<typename CharacterType, size_t size>
>+static inline String toNumeric(int number, const CharacterType(&alphabet)[size])
> {
>-    toNumeric(builder, number, alphabet, size);
>+    return toNumeric(number, alphabet, size);
> }
> 
>-template <typename CharacterType, size_t size>
>-static inline void toSymbolic(StringBuilder& builder, int number, const CharacterType(&alphabet)[size])
>+template<typename CharacterType, size_t size>
>+static inline String toSymbolic(int number, const CharacterType(&alphabet)[size])
> {    
>-    toSymbolic(builder, number, alphabet, size);
>+    return toSymbolic(number, alphabet, size);
> }
> 
> static NEVER_INLINE int toHebrewUnder1000(int number, UChar letters[5])
>@@ -194,21 +197,20 @@ static NEVER_INLINE int toHebrewUnder1000(int number, UChar letters[5])
>     return length;
> }
> 
>-static NEVER_INLINE void toHebrew(StringBuilder& builder, int number)
>+static NEVER_INLINE String toHebrew(int number)
> {
>     // FIXME: CSS3 mentions ways to make this work for much larger numbers.
>     ASSERT(number >= 0 && number <= 999999);
> 
>     if (number == 0) {
>         static const UChar hebrewZero[3] = { 0x05D0, 0x05E4, 0x05E1 };
>-        builder.append(hebrewZero, 3);
>-        return;
>+        return String { hebrewZero, 3 };
>     }
> 
>-    const int lettersSize = 11; // big enough for two 5-digit sequences plus a quote mark between
>+    constexpr unsigned lettersSize = 11; // big enough for two 5-digit sequences plus a quote mark between
>     UChar letters[lettersSize];
> 
>-    int length;
>+    unsigned length;
>     if (number < 1000)
>         length = 0;
>     else {
>@@ -219,15 +221,15 @@ static NEVER_INLINE void toHebrew(StringBuilder& builder, int number)
>     length += toHebrewUnder1000(number, letters + length);
> 
>     ASSERT(length <= lettersSize);
>-    builder.append(letters, length);
>+    return String { letters, length };
> }
> 
>-static NEVER_INLINE int toArmenianUnder10000(int number, bool upper, bool addCircumflex, UChar letters[9])
>+static NEVER_INLINE unsigned toArmenianUnder10000(int number, LetterCase letterCase, bool addCircumflex, UChar letters[9])
> {
>     ASSERT(number >= 0 && number < 10000);
>-    int length = 0;
>+    unsigned length = 0;
> 
>-    int lowerOffset = upper ? 0 : 0x0030;
>+    int lowerOffset = letterCase == LetterCase::Upper ? 0 : 0x0030;
> 
>     if (int thousands = number / 1000) {
>         if (thousands == 7) {
>@@ -262,28 +264,28 @@ static NEVER_INLINE int toArmenianUnder10000(int number, bool upper, bool addCir
>     return length;
> }
> 
>-static NEVER_INLINE void toArmenian(StringBuilder& builder, int number, bool upper)
>+static NEVER_INLINE String toArmenian(int number, LetterCase letterCase)
> {
>     ASSERT(number >= 1 && number <= 99999999);
> 
>-    const int lettersSize = 18; // twice what toArmenianUnder10000 needs
>+    constexpr unsigned lettersSize = 18; // twice what toArmenianUnder10000 needs
>     UChar letters[lettersSize];
> 
>-    int length = toArmenianUnder10000(number / 10000, upper, true, letters);
>-    length += toArmenianUnder10000(number % 10000, upper, false, letters + length);
>+    unsigned length = toArmenianUnder10000(number / 10000, letterCase, true, letters);
>+    length += toArmenianUnder10000(number % 10000, letterCase, false, letters + length);
> 
>     ASSERT(length <= lettersSize);
>-    builder.append(letters, length);
>+    return String { letters, length };
> }
> 
>-static NEVER_INLINE void toGeorgian(StringBuilder& builder, int number)
>+static NEVER_INLINE String toGeorgian(int number)
> {
>     ASSERT(number >= 1 && number <= 19999);
> 
>-    const int lettersSize = 5;
>+    constexpr unsigned lettersSize = 5;
>     UChar letters[lettersSize];
> 
>-    int length = 0;
>+    unsigned length = 0;
> 
>     if (number > 9999)
>         letters[length++] = 0x10F5;
>@@ -317,12 +319,12 @@ static NEVER_INLINE void toGeorgian(StringBuilder& builder, int number)
>     }
> 
>     ASSERT(length <= lettersSize);
>-    builder.append(letters, length);
>+    return String { letters, length };
> }
> 
> // The table uses the order from the CSS3 specification:
> // first 3 group markers, then 3 digit markers, then ten digits.
>-static NEVER_INLINE void toCJKIdeographic(StringBuilder& builder, int number, const UChar table[16])
>+static NEVER_INLINE String toCJKIdeographic(int number, const UChar table[16])
> {
>     ASSERT(number >= 0);
> 
>@@ -334,13 +336,11 @@ static NEVER_INLINE void toCJKIdeographic(StringBuilder& builder, int number, co
>         digit5, digit6, digit7, digit8, digit9
>     };
> 
>-    if (number == 0) {
>-        builder.append(table[digit0 - 1]);
>-        return;
>-    }
>+    if (!number)
>+        return String { &table[digit0 - 1] , 1 };
> 
>-    const int groupLength = 8; // 4 digits, 3 digit markers, and a group marker
>-    const int bufferLength = 4 * groupLength;
>+    constexpr unsigned groupLength = 8; // 4 digits, 3 digit markers, and a group marker
>+    constexpr unsigned bufferLength = 4 * groupLength;
>     AbstractCJKChar buffer[bufferLength] = { noChar };
> 
>     for (int i = 0; i < 4; ++i) {
>@@ -381,16 +381,15 @@ static NEVER_INLINE void toCJKIdeographic(StringBuilder& builder, int number, co
>             group[4] = noChar;
>         }
> 
>-        if (number == 0)
>+        if (!number)
>             break;
>     }
> 
>-    // Convert into characters, omitting consecutive runs of digit0 and
>-    // any trailing digit0.
>-    int length = 0;
>+    // Convert into characters, omitting consecutive runs of digit0 and trailing digit0.
>+    unsigned length = 0;
>     UChar characters[bufferLength];
>     AbstractCJKChar last = noChar;
>-    for (int i = 0; i < bufferLength; ++i) {
>+    for (unsigned i = 0; i < bufferLength; ++i) {
>         AbstractCJKChar a = buffer[i];
>         if (a != noChar) {
>             if (a != digit0 || last != digit0)
>@@ -401,7 +400,7 @@ static NEVER_INLINE void toCJKIdeographic(StringBuilder& builder, int number, co
>     if (last == digit0)
>         --length;
> 
>-    builder.append(characters, length);
>+    return String { characters, length };
> }
> 
> static ListStyleType effectiveListMarkerType(ListStyleType type, int value)
>@@ -506,7 +505,7 @@ static ListStyleType effectiveListMarkerType(ListStyleType type, int value)
> static UChar listMarkerSuffix(ListStyleType type, int value)
> {
>     // If the list-style-type cannot represent |value| because it's outside its
>-    // ordinal range then we fall back to some list style that can represent |value|.
>+    // ordinal range then we fall back to another list style that can represent |value|.
>     ListStyleType effectiveType = effectiveListMarkerType(type, value);
> 
>     // Note, the following switch statement has been explicitly
>@@ -604,76 +603,62 @@ static UChar listMarkerSuffix(ListStyleType type, int value)
> 
> String listMarkerText(ListStyleType type, int value)
> {
>-    StringBuilder builder;
>-
>-    // If the list-style-type, say hebrew, cannot represent |value| because it's outside
>-    // its ordinal range then we fallback to some list style that can represent |value|.
>+    // If the list-style-type cannot represent |value| because it's outside its
>+    // ordinal range then we fall back to another list style that can represent |value|.
>     switch (effectiveListMarkerType(type, value)) {
>     case ListStyleType::None:
>         return emptyString();
> 
>     case ListStyleType::Asterisks: {
>         static const LChar asterisksSymbols[1] = { 0x2A };
>-        toSymbolic(builder, value, asterisksSymbols);
>-        break;
>+        return toSymbolic(value, asterisksSymbols);
>     }
>     // We use the same characters for text security.
>     // See RenderText::setInternalString.
>     case ListStyleType::Circle:
>-        builder.append(whiteBullet);
>-        break;
>+        return String { &whiteBullet, 1 };
>     case ListStyleType::Disc:
>-        builder.append(bullet);
>-        break;
>+        return String { &bullet, 1 };
>     case ListStyleType::Footnotes: {
>         static const UChar footnotesSymbols[4] = { 0x002A, 0x2051, 0x2020, 0x2021 };
>-        toSymbolic(builder, value, footnotesSymbols);
>-        break;
>+        return toSymbolic(value, footnotesSymbols);
>     }
>     case ListStyleType::Square:
>-        // The CSS 2.1 test suite uses U+25EE BLACK MEDIUM SMALL SQUARE
>-        // instead, but I think this looks better.
>-        builder.append(blackSquare);
>-        break;
>+        // The CSS 2.1 test suite uses U+25EE BLACK MEDIUM SMALL SQUARE instead,
>+        // but we used this because we thought it looked better.
>+        return String { &blackSquare, 1 };
> 
>     case ListStyleType::Decimal:
>-        builder.appendNumber(value);
>-        break;
>+        return String::number(value);
> 
>     case ListStyleType::DecimalLeadingZero:
>-        if (value < -9 || value > 9) {
>-            builder.appendNumber(value);
>-            break;
>+        if (value >= 0 && value <= 9) {
>+            LChar characters[2] = { '0', static_cast<LChar>('0' + value) }; // 00 to 09
>+            return String { characters, 2 };
>         }
>-        if (value < 0) {
>-            builder.appendLiteral("-0");
>-            builder.appendNumber(-value); // -01 to -09
>-            break;
>+        if (value >= -9 && value <= -1) {
>+            LChar characters[3] = { '-', '0', static_cast<LChar>('0' - value) }; // -01 to -09
>+            return String { characters, 3 };
>         }
>-        builder.append('0');
>-        builder.appendNumber(value); // 00 to 09
>-        break;
>+        return String::number(value);
> 
>     case ListStyleType::ArabicIndic: {
>         static const UChar arabicIndicNumerals[10] = {
>             0x0660, 0x0661, 0x0662, 0x0663, 0x0664, 0x0665, 0x0666, 0x0667, 0x0668, 0x0669
>         };
>-        toNumeric(builder, value, arabicIndicNumerals);
>-        break;
>+        return toNumeric(value, arabicIndicNumerals);
>     }
> 
>     case ListStyleType::Binary: {
>         static const LChar binaryNumerals[2] = { '0', '1' };
>-        toNumeric(builder, value, binaryNumerals);
>-        break;
>+        return toNumeric(value, binaryNumerals);
>     }
> 
>     case ListStyleType::Bengali: {
>         static const UChar bengaliNumerals[10] = {
>             0x09E6, 0x09E7, 0x09E8, 0x09E9, 0x09EA, 0x09EB, 0x09EC, 0x09ED, 0x09EE, 0x09EF
>         };
>-        toNumeric(builder, value, bengaliNumerals);
>-        break;
>+        return toNumeric(value, bengaliNumerals);
>     }
> 
>     case ListStyleType::Cambodian:
>@@ -681,121 +666,104 @@ String listMarkerText(ListStyleType type, int value)
>         static const UChar khmerNumerals[10] = {
>             0x17E0, 0x17E1, 0x17E2, 0x17E3, 0x17E4, 0x17E5, 0x17E6, 0x17E7, 0x17E8, 0x17E9
>         };
>-        toNumeric(builder, value, khmerNumerals);
>-        break;
>+        return toNumeric(value, khmerNumerals);
>     }
>     case ListStyleType::Devanagari: {
>         static const UChar devanagariNumerals[10] = {
>             0x0966, 0x0967, 0x0968, 0x0969, 0x096A, 0x096B, 0x096C, 0x096D, 0x096E, 0x096F
>         };
>-        toNumeric(builder, value, devanagariNumerals);
>-        break;
>+        return toNumeric(value, devanagariNumerals);
>     }
>     case ListStyleType::Gujarati: {
>         static const UChar gujaratiNumerals[10] = {
>             0x0AE6, 0x0AE7, 0x0AE8, 0x0AE9, 0x0AEA, 0x0AEB, 0x0AEC, 0x0AED, 0x0AEE, 0x0AEF
>         };
>-        toNumeric(builder, value, gujaratiNumerals);
>-        break;
>+        return toNumeric(value, gujaratiNumerals);
>     }
>     case ListStyleType::Gurmukhi: {
>         static const UChar gurmukhiNumerals[10] = {
>             0x0A66, 0x0A67, 0x0A68, 0x0A69, 0x0A6A, 0x0A6B, 0x0A6C, 0x0A6D, 0x0A6E, 0x0A6F
>         };
>-        toNumeric(builder, value, gurmukhiNumerals);
>-        break;
>+        return toNumeric(value, gurmukhiNumerals);
>     }
>     case ListStyleType::Kannada: {
>         static const UChar kannadaNumerals[10] = {
>             0x0CE6, 0x0CE7, 0x0CE8, 0x0CE9, 0x0CEA, 0x0CEB, 0x0CEC, 0x0CED, 0x0CEE, 0x0CEF
>         };
>-        toNumeric(builder, value, kannadaNumerals);
>-        break;
>+        return toNumeric(value, kannadaNumerals);
>     }
>     case ListStyleType::LowerHexadecimal: {
>         static const LChar lowerHexadecimalNumerals[16] = {
>             '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
>         };
>-        toNumeric(builder, value, lowerHexadecimalNumerals);
>-        break;
>+        return toNumeric(value, lowerHexadecimalNumerals);
>     }
>     case ListStyleType::Lao: {
>         static const UChar laoNumerals[10] = {
>             0x0ED0, 0x0ED1, 0x0ED2, 0x0ED3, 0x0ED4, 0x0ED5, 0x0ED6, 0x0ED7, 0x0ED8, 0x0ED9
>         };
>-        toNumeric(builder, value, laoNumerals);
>-        break;
>+        return toNumeric(value, laoNumerals);
>     }
>     case ListStyleType::Malayalam: {
>         static const UChar malayalamNumerals[10] = {
>             0x0D66, 0x0D67, 0x0D68, 0x0D69, 0x0D6A, 0x0D6B, 0x0D6C, 0x0D6D, 0x0D6E, 0x0D6F
>         };
>-        toNumeric(builder, value, malayalamNumerals);
>-        break;
>+        return toNumeric(value, malayalamNumerals);
>     }
>     case ListStyleType::Mongolian: {
>         static const UChar mongolianNumerals[10] = {
>             0x1810, 0x1811, 0x1812, 0x1813, 0x1814, 0x1815, 0x1816, 0x1817, 0x1818, 0x1819
>         };
>-        toNumeric(builder, value, mongolianNumerals);
>-        break;
>+        return toNumeric(value, mongolianNumerals);
>     }
>     case ListStyleType::Myanmar: {
>         static const UChar myanmarNumerals[10] = {
>             0x1040, 0x1041, 0x1042, 0x1043, 0x1044, 0x1045, 0x1046, 0x1047, 0x1048, 0x1049
>         };
>-        toNumeric(builder, value, myanmarNumerals);
>-        break;
>+        return toNumeric(value, myanmarNumerals);
>     }
>     case ListStyleType::Octal: {
>         static const LChar octalNumerals[8] = {
>             '0', '1', '2', '3', '4', '5', '6', '7'
>         };
>-        toNumeric(builder, value, octalNumerals);
>-        break;
>+        return toNumeric(value, octalNumerals);
>     }
>     case ListStyleType::Oriya: {
>         static const UChar oriyaNumerals[10] = {
>             0x0B66, 0x0B67, 0x0B68, 0x0B69, 0x0B6A, 0x0B6B, 0x0B6C, 0x0B6D, 0x0B6E, 0x0B6F
>         };
>-        toNumeric(builder, value, oriyaNumerals);
>-        break;
>+        return toNumeric(value, oriyaNumerals);
>     }
>     case ListStyleType::Persian:
>     case ListStyleType::Urdu: {
>         static const UChar urduNumerals[10] = {
>             0x06F0, 0x06F1, 0x06F2, 0x06F3, 0x06F4, 0x06F5, 0x06F6, 0x06F7, 0x06F8, 0x06F9
>         };
>-        toNumeric(builder, value, urduNumerals);
>-        break;
>+        return toNumeric(value, urduNumerals);
>     }
>     case ListStyleType::Telugu: {
>         static const UChar teluguNumerals[10] = {
>             0x0C66, 0x0C67, 0x0C68, 0x0C69, 0x0C6A, 0x0C6B, 0x0C6C, 0x0C6D, 0x0C6E, 0x0C6F
>         };
>-        toNumeric(builder, value, teluguNumerals);
>-        break;
>+        return toNumeric(value, teluguNumerals);
>     }
>     case ListStyleType::Tibetan: {
>         static const UChar tibetanNumerals[10] = {
>             0x0F20, 0x0F21, 0x0F22, 0x0F23, 0x0F24, 0x0F25, 0x0F26, 0x0F27, 0x0F28, 0x0F29
>         };
>-        toNumeric(builder, value, tibetanNumerals);
>-        break;
>+        return toNumeric(value, tibetanNumerals);
>     }
>     case ListStyleType::Thai: {
>         static const UChar thaiNumerals[10] = {
>             0x0E50, 0x0E51, 0x0E52, 0x0E53, 0x0E54, 0x0E55, 0x0E56, 0x0E57, 0x0E58, 0x0E59
>         };
>-        toNumeric(builder, value, thaiNumerals);
>-        break;
>+        return toNumeric(value, thaiNumerals);
>     }
>     case ListStyleType::UpperHexadecimal: {
>         static const LChar upperHexadecimalNumerals[16] = {
>             '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
>         };
>-        toNumeric(builder, value, upperHexadecimalNumerals);
>-        break;
>+        return toNumeric(value, upperHexadecimalNumerals);
>     }
> 
>     case ListStyleType::LowerAlpha:
>@@ -804,8 +772,7 @@ String listMarkerText(ListStyleType type, int value)
>             'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
>             'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
>         };
>-        toAlphabetic(builder, value, lowerLatinAlphabet);
>-        break;
>+        return toAlphabetic(value, lowerLatinAlphabet);
>     }
>     case ListStyleType::UpperAlpha:
>     case ListStyleType::UpperLatin: {
>@@ -813,8 +780,7 @@ String listMarkerText(ListStyleType type, int value)
>             'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
>             'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
>         };
>-        toAlphabetic(builder, value, upperLatinAlphabet);
>-        break;
>+        return toAlphabetic(value, upperLatinAlphabet);
>     }
>     case ListStyleType::LowerGreek: {
>         static const UChar lowerGreekAlphabet[24] = {
>@@ -822,8 +788,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x03B9, 0x03BA, 0x03BB, 0x03BC, 0x03BD, 0x03BE, 0x03BF, 0x03C0,
>             0x03C1, 0x03C3, 0x03C4, 0x03C5, 0x03C6, 0x03C7, 0x03C8, 0x03C9
>         };
>-        toAlphabetic(builder, value, lowerGreekAlphabet);
>-        break;
>+        return toAlphabetic(value, lowerGreekAlphabet);
>     }
> 
>     case ListStyleType::Hiragana: {
>@@ -837,8 +802,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x3080, 0x3081, 0x3082, 0x3084, 0x3086, 0x3088, 0x3089, 0x308A,
>             0x308B, 0x308C, 0x308D, 0x308F, 0x3090, 0x3091, 0x3092, 0x3093
>         };
>-        toAlphabetic(builder, value, hiraganaAlphabet);
>-        break;
>+        return toAlphabetic(value, hiraganaAlphabet);
>     }
>     case ListStyleType::HiraganaIroha: {
>         // FIXME: This table comes from the CSS3 draft, and is probably
>@@ -851,8 +815,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x3053, 0x3048, 0x3066, 0x3042, 0x3055, 0x304D, 0x3086, 0x3081,
>             0x307F, 0x3057, 0x3091, 0x3072, 0x3082, 0x305B, 0x3059
>         };
>-        toAlphabetic(builder, value, hiraganaIrohaAlphabet);
>-        break;
>+        return toAlphabetic(value, hiraganaIrohaAlphabet);
>     }
>     case ListStyleType::Katakana: {
>         // FIXME: This table comes from the CSS3 draft, and is probably
>@@ -865,8 +828,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x30E0, 0x30E1, 0x30E2, 0x30E4, 0x30E6, 0x30E8, 0x30E9, 0x30EA,
>             0x30EB, 0x30EC, 0x30ED, 0x30EF, 0x30F0, 0x30F1, 0x30F2, 0x30F3
>         };
>-        toAlphabetic(builder, value, katakanaAlphabet);
>-        break;
>+        return toAlphabetic(value, katakanaAlphabet);
>     }
>     case ListStyleType::KatakanaIroha: {
>         // FIXME: This table comes from the CSS3 draft, and is probably
>@@ -879,8 +841,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x30B3, 0x30A8, 0x30C6, 0x30A2, 0x30B5, 0x30AD, 0x30E6, 0x30E1,
>             0x30DF, 0x30B7, 0x30F1, 0x30D2, 0x30E2, 0x30BB, 0x30B9
>         };
>-        toAlphabetic(builder, value, katakanaIrohaAlphabet);
>-        break;
>+        return toAlphabetic(value, katakanaIrohaAlphabet);
>     }
> 
>     case ListStyleType::Afar:
>@@ -890,8 +851,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x1200, 0x1208, 0x1210, 0x1218, 0x1228, 0x1230, 0x1260, 0x1270, 0x1290,
>             0x12A0, 0x12A8, 0x12C8, 0x12D0, 0x12E8, 0x12F0, 0x1308, 0x1338, 0x1348
>         };
>-        toAlphabetic(builder, value, ethiopicHalehameAaErAlphabet);
>-        break;
>+        return toAlphabetic(value, ethiopicHalehameAaErAlphabet);
>     }
>     case ListStyleType::Amharic:
>     case ListStyleType::EthiopicHalehameAmEt: {
>@@ -901,8 +861,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x12C8, 0x12D0, 0x12D8, 0x12E0, 0x12E8, 0x12F0, 0x1300, 0x1308, 0x1320,
>             0x1328, 0x1330, 0x1338, 0x1340, 0x1348, 0x1350
>         };
>-        toAlphabetic(builder, value, ethiopicHalehameAmEtAlphabet);
>-        break;
>+        return toAlphabetic(value, ethiopicHalehameAmEtAlphabet);
>     }
>     case ListStyleType::AmharicAbegede:
>     case ListStyleType::EthiopicAbegedeAmEt: {
>@@ -912,24 +871,21 @@ String listMarkerText(ListStyleType type, int value)
>             0x1298, 0x1220, 0x12D0, 0x1348, 0x1338, 0x1240, 0x1228, 0x1230, 0x1238,
>             0x1270, 0x1278, 0x1280, 0x1340, 0x1330, 0x1350
>         };
>-        toAlphabetic(builder, value, ethiopicAbegedeAmEtAlphabet);
>-        break;
>+        return toAlphabetic(value, ethiopicAbegedeAmEtAlphabet);
>     }
>     case ListStyleType::CjkEarthlyBranch: {
>         static const UChar cjkEarthlyBranchAlphabet[12] = {
>             0x5B50, 0x4E11, 0x5BC5, 0x536F, 0x8FB0, 0x5DF3, 0x5348, 0x672A, 0x7533,
>             0x9149, 0x620C, 0x4EA5
>         };
>-        toAlphabetic(builder, value, cjkEarthlyBranchAlphabet);
>-        break;
>+        return toAlphabetic(value, cjkEarthlyBranchAlphabet);
>     }
>     case ListStyleType::CjkHeavenlyStem: {
>         static const UChar cjkHeavenlyStemAlphabet[10] = {
>             0x7532, 0x4E59, 0x4E19, 0x4E01, 0x620A, 0x5DF1, 0x5E9A, 0x8F9B, 0x58EC,
>             0x7678
>         };
>-        toAlphabetic(builder, value, cjkHeavenlyStemAlphabet);
>-        break;
>+        return toAlphabetic(value, cjkHeavenlyStemAlphabet);
>     }
>     case ListStyleType::Ethiopic:
>     case ListStyleType::EthiopicHalehameGez: {
>@@ -938,8 +894,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x1270, 0x1280, 0x1290, 0x12A0, 0x12A8, 0x12C8, 0x12D0, 0x12D8, 0x12E8,
>             0x12F0, 0x1308, 0x1320, 0x1330, 0x1338, 0x1340, 0x1348, 0x1350
>         };
>-        toAlphabetic(builder, value, ethiopicHalehameGezAlphabet);
>-        break;
>+        return toAlphabetic(value, ethiopicHalehameGezAlphabet);
>     }
>     case ListStyleType::EthiopicAbegede:
>     case ListStyleType::EthiopicAbegedeGez: {
>@@ -948,24 +903,21 @@ String listMarkerText(ListStyleType type, int value)
>             0x12E8, 0x12A8, 0x1208, 0x1218, 0x1290, 0x1220, 0x12D0, 0x1348, 0x1338,
>             0x1240, 0x1228, 0x1230, 0x1270, 0x1280, 0x1340, 0x1330, 0x1350
>         };
>-        toAlphabetic(builder, value, ethiopicAbegedeGezAlphabet);
>-        break;
>+        return toAlphabetic(value, ethiopicAbegedeGezAlphabet);
>     }
>     case ListStyleType::HangulConsonant: {
>         static const UChar hangulConsonantAlphabet[14] = {
>             0x3131, 0x3134, 0x3137, 0x3139, 0x3141, 0x3142, 0x3145, 0x3147, 0x3148,
>             0x314A, 0x314B, 0x314C, 0x314D, 0x314E
>         };
>-        toAlphabetic(builder, value, hangulConsonantAlphabet);
>-        break;
>+        return toAlphabetic(value, hangulConsonantAlphabet);
>     }
>     case ListStyleType::Hangul: {
>         static const UChar hangulAlphabet[14] = {
>             0xAC00, 0xB098, 0xB2E4, 0xB77C, 0xB9C8, 0xBC14, 0xC0AC, 0xC544, 0xC790,
>             0xCC28, 0xCE74, 0xD0C0, 0xD30C, 0xD558
>         };
>-        toAlphabetic(builder, value, hangulAlphabet);
>-        break;
>+        return toAlphabetic(value, hangulAlphabet);
>     }
>     case ListStyleType::Oromo:
>     case ListStyleType::EthiopicHalehameOmEt: {
>@@ -974,8 +926,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x1278, 0x1290, 0x1298, 0x12A0, 0x12A8, 0x12C8, 0x12E8, 0x12F0, 0x12F8,
>             0x1300, 0x1308, 0x1320, 0x1328, 0x1338, 0x1330, 0x1348
>         };
>-        toAlphabetic(builder, value, ethiopicHalehameOmEtAlphabet);
>-        break;
>+        return toAlphabetic(value, ethiopicHalehameOmEtAlphabet);
>     }
>     case ListStyleType::Sidama:
>     case ListStyleType::EthiopicHalehameSidEt: {
>@@ -984,8 +935,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x1270, 0x1278, 0x1290, 0x1298, 0x12A0, 0x12A8, 0x12C8, 0x12E8, 0x12F0,
>             0x12F8, 0x1300, 0x1308, 0x1320, 0x1328, 0x1338, 0x1330, 0x1348
>         };
>-        toAlphabetic(builder, value, ethiopicHalehameSidEtAlphabet);
>-        break;
>+        return toAlphabetic(value, ethiopicHalehameSidEtAlphabet);
>     }
>     case ListStyleType::Somali:
>     case ListStyleType::EthiopicHalehameSoEt: {
>@@ -994,8 +944,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x1270, 0x1290, 0x12A0, 0x12A8, 0x12B8, 0x12C8, 0x12D0, 0x12E8, 0x12F0,
>             0x1300, 0x1308, 0x1338, 0x1348
>         };
>-        toAlphabetic(builder, value, ethiopicHalehameSoEtAlphabet);
>-        break;
>+        return toAlphabetic(value, ethiopicHalehameSoEtAlphabet);
>     }
>     case ListStyleType::Tigre:
>     case ListStyleType::EthiopicHalehameTig: {
>@@ -1004,8 +953,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x1270, 0x1278, 0x1290, 0x12A0, 0x12A8, 0x12C8, 0x12D0, 0x12D8, 0x12E8,
>             0x12F0, 0x1300, 0x1308, 0x1320, 0x1328, 0x1338, 0x1330, 0x1348, 0x1350
>         };
>-        toAlphabetic(builder, value, ethiopicHalehameTigAlphabet);
>-        break;
>+        return toAlphabetic(value, ethiopicHalehameTigAlphabet);
>     }
>     case ListStyleType::TigrinyaEr:
>     case ListStyleType::EthiopicHalehameTiEr: {
>@@ -1015,8 +963,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x12D0, 0x12D8, 0x12E0, 0x12E8, 0x12F0, 0x1300, 0x1308, 0x1320, 0x1328,
>             0x1330, 0x1338, 0x1348, 0x1350
>         };
>-        toAlphabetic(builder, value, ethiopicHalehameTiErAlphabet);
>-        break;
>+        return toAlphabetic(value, ethiopicHalehameTiErAlphabet);
>     }
>     case ListStyleType::TigrinyaErAbegede:
>     case ListStyleType::EthiopicAbegedeTiEr: {
>@@ -1026,8 +973,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x1298, 0x12D0, 0x1348, 0x1338, 0x1240, 0x1250, 0x1228, 0x1230, 0x1238,
>             0x1270, 0x1278, 0x1330, 0x1350
>         };
>-        toAlphabetic(builder, value, ethiopicAbegedeTiErAlphabet);
>-        break;
>+        return toAlphabetic(value, ethiopicAbegedeTiErAlphabet);
>     }
>     case ListStyleType::TigrinyaEt:
>     case ListStyleType::EthiopicHalehameTiEt: {
>@@ -1037,8 +983,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x12B8, 0x12C8, 0x12D0, 0x12D8, 0x12E0, 0x12E8, 0x12F0, 0x1300, 0x1308,
>             0x1320, 0x1328, 0x1330, 0x1338, 0x1340, 0x1348, 0x1350
>         };
>-        toAlphabetic(builder, value, ethiopicHalehameTiEtAlphabet);
>-        break;
>+        return toAlphabetic(value, ethiopicHalehameTiEtAlphabet);
>     }
>     case ListStyleType::TigrinyaEtAbegede:
>     case ListStyleType::EthiopicAbegedeTiEt: {
>@@ -1048,8 +993,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x1298, 0x1220, 0x12D0, 0x1348, 0x1338, 0x1240, 0x1250, 0x1228, 0x1230,
>             0x1238, 0x1270, 0x1278, 0x1280, 0x1340, 0x1330, 0x1350
>         };
>-        toAlphabetic(builder, value, ethiopicAbegedeTiEtAlphabet);
>-        break;
>+        return toAlphabetic(value, ethiopicAbegedeTiEtAlphabet);
>     }
>     case ListStyleType::UpperGreek: {
>         static const UChar upperGreekAlphabet[24] = {
>@@ -1057,8 +1001,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x039A, 0x039B, 0x039C, 0x039D, 0x039E, 0x039F, 0x03A0, 0x03A1, 0x03A3,
>             0x03A4, 0x03A5, 0x03A6, 0x03A7, 0x03A8, 0x03A9
>         };
>-        toAlphabetic(builder, value, upperGreekAlphabet);
>-        break;
>+        return toAlphabetic(value, upperGreekAlphabet);
>     }
>     case ListStyleType::LowerNorwegian: {
>         static const LChar lowerNorwegianAlphabet[29] = {
>@@ -1067,8 +1010,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0xE6,
>             0xF8, 0xE5
>         };
>-        toAlphabetic(builder, value, lowerNorwegianAlphabet);
>-        break;
>+        return toAlphabetic(value, lowerNorwegianAlphabet);
>     }
>     case ListStyleType::UpperNorwegian: {
>         static const LChar upperNorwegianAlphabet[29] = {
>@@ -1077,8 +1019,7 @@ String listMarkerText(ListStyleType type, int value)
>             0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0xC6,
>             0xD8, 0xC5
>         };
>-        toAlphabetic(builder, value, upperNorwegianAlphabet);
>-        break;
>+        return toAlphabetic(value, upperNorwegianAlphabet);
>     }
>     case ListStyleType::CJKIdeographic: {
>         static const UChar traditionalChineseInformalTable[16] = {
>@@ -1087,36 +1028,30 @@ String listMarkerText(ListStyleType type, int value)
>             0x96F6, 0x4E00, 0x4E8C, 0x4E09, 0x56DB,
>             0x4E94, 0x516D, 0x4E03, 0x516B, 0x4E5D
>         };
>-        toCJKIdeographic(builder, value, traditionalChineseInformalTable);
>-        break;
>+        return toCJKIdeographic(value, traditionalChineseInformalTable);
>     }
> 
>     case ListStyleType::LowerRoman:
>-        toRoman(builder, value, false);
>-        break;
>+        return toRoman(value, LetterCase::Lower);
>     case ListStyleType::UpperRoman:
>-        toRoman(builder, value, true);
>-        break;
>+        return toRoman(value, LetterCase::Upper);
> 
>+    // A CSS3 draft said that "armenian" means "lower-armenian". But the CSS2.1 test
>+    // suite contains uppercase test results for "armenian"; our behavior matches that.
>     case ListStyleType::Armenian:
>     case ListStyleType::UpperArmenian:
>-        // CSS3 says "armenian" means "lower-armenian".
>-        // But the CSS2.1 test suite contains uppercase test results for "armenian",
>-        // so we'll match the test suite.
>-        toArmenian(builder, value, true);
>-        break;
>+        return toArmenian(value, LetterCase::Upper);
>     case ListStyleType::LowerArmenian:
>-        toArmenian(builder, value, false);
>-        break;
>+        return toArmenian(value, LetterCase::Lower);
>+
>     case ListStyleType::Georgian:
>-        toGeorgian(builder, value);
>-        break;
>+        return toGeorgian(value);
>     case ListStyleType::Hebrew:
>-        toHebrew(builder, value);
>-        break;
>+        return toHebrew(value);
>     }
> 
>-    return builder.toString();
>+    ASSERT_NOT_REACHED();
>+    return emptyString();
> }
> 
> RenderListMarker::RenderListMarker(RenderListItem& listItem, RenderStyle&& style)
>@@ -1350,32 +1285,35 @@ void RenderListMarker::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffse
>     else {
>         const UChar suffix = listMarkerSuffix(type, m_listItem->value());
> 
>-        // Text is not arbitrary. We can judge whether it's RTL from the first character,
>-        // and we only need to handle the direction U_RIGHT_TO_LEFT for now.
>-        bool textNeedsReversing = u_charDirection(m_text[0]) == U_RIGHT_TO_LEFT;
>-        String toDraw;
>-        if (textNeedsReversing) {
>+        // FIXME: Could use a Vector with inline capacity instead of String to avoid
>+        // memory allocation here.
>+        String textToDraw;
>+
>+        // Since marker text is not arbitrary, we can judge its direction just by
>+        // checking the first character, and only need to handle U_RIGHT_TO_LEFT.
>+        // FIXME: Could check more efficiently than u_charDirection, since we know
>+        // only certain characters are used and only need to check for U_RIGHT_TO_LEFT.
>+        if (u_charDirection(m_text[0]) == U_RIGHT_TO_LEFT) {
>             unsigned length = m_text.length();
>-            StringBuilder buffer;
>-            buffer.reserveCapacity(length + 2);
>+            UChar* characters;
>+            textToDraw = String::createUninitialized(length + 2, characters);
>             if (!style().isLeftToRightDirection()) {
>-                buffer.append(space);
>-                buffer.append(suffix);
>+                *characters++ = space;
>+                *characters++ = suffix;
>             }
>             for (unsigned i = 0; i < length; ++i)
>-                buffer.append(m_text[length - i - 1]);
>+                *characters++ = m_text[length - i - 1];
>             if (style().isLeftToRightDirection()) {
>-                buffer.append(suffix);
>-                buffer.append(space);
>+                *characters++ = suffix;
>+                *characters++ = space;
>             }
>-            toDraw = buffer.toString();
>         } else {
>             if (style().isLeftToRightDirection())
>-                toDraw = m_text + String(&suffix, 1) + String(&space, 1);
>+                textToDraw = makeString(m_text, suffix, space);
>             else
>-                toDraw = String(&space, 1) + String(&suffix, 1) + m_text;
>+                textToDraw = makeString(space, suffix, m_text);
>         }
>-        textRun.setText(StringView(toDraw));
>+        textRun.setText(textToDraw);
> 
>         context.drawText(font, textRun, textOrigin);
>     }
>@@ -1568,8 +1506,8 @@ void RenderListMarker::computePreferredLogicalWidths()
>     case ListStyleType::Footnotes: {
>         TextRun run = RenderBlock::constructTextRun(m_text, style());
>         logicalWidth = font.width(run); // no suffix for these types
>-    }
>         break;
>+    }
>     case ListStyleType::Circle:
>     case ListStyleType::Disc:
>     case ListStyleType::Square:
>diff --git a/Source/WebCore/svg/SVGPathUtilities.cpp b/Source/WebCore/svg/SVGPathUtilities.cpp
>index 4b79c1fab02dd5851fbba0707d9dd34fcc3fbcec..db8f929ad19b5be0f7949ba5b5244180fcaa7aa8 100644
>--- a/Source/WebCore/svg/SVGPathUtilities.cpp
>+++ b/Source/WebCore/svg/SVGPathUtilities.cpp
>@@ -60,39 +60,39 @@ String buildStringFromPath(const Path& path)
>             switch (element.type) {
>             case PathElementMoveToPoint:
>                 builder.append('M');
>-                builder.appendShortestFormNumber(element.points[0].x());
>+                builder.appendNumber(element.points[0].x());
>                 builder.append(' ');
>-                builder.appendShortestFormNumber(element.points[0].y());
>+                builder.appendNumber(element.points[0].y());
>                 break;
>             case PathElementAddLineToPoint:
>                 builder.append('L');
>-                builder.appendShortestFormNumber(element.points[0].x());
>+                builder.appendNumber(element.points[0].x());
>                 builder.append(' ');
>-                builder.appendShortestFormNumber(element.points[0].y());
>+                builder.appendNumber(element.points[0].y());
>                 break;
>             case PathElementAddQuadCurveToPoint:
>                 builder.append('Q');
>-                builder.appendShortestFormNumber(element.points[0].x());
>+                builder.appendNumber(element.points[0].x());
>                 builder.append(' ');
>-                builder.appendShortestFormNumber(element.points[0].y());
>+                builder.appendNumber(element.points[0].y());
>                 builder.append(',');
>-                builder.appendShortestFormNumber(element.points[1].x());
>+                builder.appendNumber(element.points[1].x());
>                 builder.append(' ');
>-                builder.appendShortestFormNumber(element.points[1].y());
>+                builder.appendNumber(element.points[1].y());
>                 break;
>             case PathElementAddCurveToPoint:
>                 builder.append('C');
>-                builder.appendShortestFormNumber(element.points[0].x());
>+                builder.appendNumber(element.points[0].x());
>                 builder.append(' ');
>-                builder.appendShortestFormNumber(element.points[0].y());
>+                builder.appendNumber(element.points[0].y());
>                 builder.append(',');
>-                builder.appendShortestFormNumber(element.points[1].x());
>+                builder.appendNumber(element.points[1].x());
>                 builder.append(' ');
>-                builder.appendShortestFormNumber(element.points[1].y());
>+                builder.appendNumber(element.points[1].y());
>                 builder.append(',');
>-                builder.appendShortestFormNumber(element.points[2].x());
>+                builder.appendNumber(element.points[2].x());
>                 builder.append(' ');
>-                builder.appendShortestFormNumber(element.points[2].y());
>+                builder.appendNumber(element.points[2].y());
>                 break;
>             case PathElementCloseSubpath:
>                 builder.append('Z');
>diff --git a/Source/WebKit/NetworkProcess/Classifier/WebResourceLoadStatisticsTelemetry.cpp b/Source/WebKit/NetworkProcess/Classifier/WebResourceLoadStatisticsTelemetry.cpp
>index 2ab5f071f3ec88fb1353013ba6930669be6dff47..75391582b1a586355ea67ff9af24878c4095a035 100644
>--- a/Source/WebKit/NetworkProcess/Classifier/WebResourceLoadStatisticsTelemetry.cpp
>+++ b/Source/WebKit/NetworkProcess/Classifier/WebResourceLoadStatisticsTelemetry.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2017-2019 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -37,7 +37,7 @@
> #include <wtf/MainThread.h>
> #include <wtf/NeverDestroyed.h>
> #include <wtf/RunLoop.h>
>-#include <wtf/text/StringBuilder.h>
>+#include <wtf/text/StringConcatenateNumbers.h>
> 
> namespace WebKit {
> using namespace WebCore;
>@@ -159,11 +159,8 @@ static void submitTopList(unsigned numberOfResourcesFromTheTop, const Vector<Pre
>     unsigned topNumberOfTimesAccessedAsFirstPartyDueToUserInteraction = median(sortedPrevalentResourcesWithoutUserInteraction, 0, numberOfResourcesFromTheTop - 1, numberOfTimesAccessedAsFirstPartyDueToUserInteractionGetter);
>     unsigned topNumberOfTimesAccessedAsFirstPartyDueToStorageAccessAPI = median(sortedPrevalentResourcesWithoutUserInteraction, 0, numberOfResourcesFromTheTop - 1, numberOfTimesAccessedAsFirstPartyDueToStorageAccessAPIGetter);
> 
>-    StringBuilder preambleBuilder;
>-    preambleBuilder.appendLiteral("top");
>-    preambleBuilder.appendNumber(numberOfResourcesFromTheTop);
>-    String descriptionPreamble = preambleBuilder.toString();
>-    
>+    String descriptionPreamble = makeString("top", numberOfResourcesFromTheTop);
>+
>     store.sendDiagnosticMessageWithValue(DiagnosticLoggingKeys::resourceLoadStatisticsTelemetryKey(), descriptionPreamble + "PrevalentResourcesWithUserInteraction",
>         topPrevalentResourcesWithUserInteraction, significantFiguresForLoggedValues, ShouldSample::No);
>     store.sendDiagnosticMessageWithValue(DiagnosticLoggingKeys::resourceLoadStatisticsTelemetryKey(), descriptionPreamble + "SubframeUnderTopFrameOrigins",
>diff --git a/Source/WebKit/UIProcess/API/APIUserScript.cpp b/Source/WebKit/UIProcess/API/APIUserScript.cpp
>index 4022efdcb97a509f6e0ef895dcb673866aa9f56f..e7cec44643e481409801b43f41f80fc73cd643a7 100644
>--- a/Source/WebKit/UIProcess/API/APIUserScript.cpp
>+++ b/Source/WebKit/UIProcess/API/APIUserScript.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2015 Apple Inc. All rights reserved.
>+ * Copyright (C) 2015-2019 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -26,18 +26,14 @@
> #include "config.h"
> #include "APIUserScript.h"
> 
>-#include <wtf/text/StringBuilder.h>
>+#include <wtf/text/StringConcatenateNumbers.h>
> 
> namespace API {
> 
> WTF::URL UserScript::generateUniqueURL()
> {
>     static uint64_t identifier;
>-
>-    StringBuilder urlStringBuilder;
>-    urlStringBuilder.appendLiteral("user-script:");
>-    urlStringBuilder.appendNumber(++identifier);
>-    return { { }, urlStringBuilder.toString() };
>+    return { { }, makeString("user-script:", ++identifier) };
> }
> 
> UserScript::UserScript(WebCore::UserScript userScript, API::UserContentWorld& world)
>diff --git a/Source/WebKit/UIProcess/API/APIUserStyleSheet.cpp b/Source/WebKit/UIProcess/API/APIUserStyleSheet.cpp
>index 3ea461fe1a156c6a9d589584037fe387c2907f08..fd69b832095ff9942289b799f99a4854eb3e7f46 100644
>--- a/Source/WebKit/UIProcess/API/APIUserStyleSheet.cpp
>+++ b/Source/WebKit/UIProcess/API/APIUserStyleSheet.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2015 Apple Inc. All rights reserved.
>+ * Copyright (C) 2015-2019 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -26,18 +26,14 @@
> #include "config.h"
> #include "APIUserStyleSheet.h"
> 
>-#include <wtf/text/StringBuilder.h>
>+#include <wtf/text/StringConcatenateNumbers.h>
> 
> namespace API {
> 
> WTF::URL UserStyleSheet::generateUniqueURL()
> {
>     static uint64_t identifier;
>-
>-    StringBuilder urlStringBuilder;
>-    urlStringBuilder.appendLiteral("user-style-sheet:");
>-    urlStringBuilder.appendNumber(++identifier);
>-    return { { }, urlStringBuilder.toString() };
>+    return { { }, makeString("user-style-sheet:", ++identifier) };
> }
> 
> UserStyleSheet::UserStyleSheet(WebCore::UserStyleSheet userStyleSheet, API::UserContentWorld& world)
>diff --git a/Tools/ChangeLog b/Tools/ChangeLog
>index 288349033ceec728bdcd2b28d92272549e0c674c..814b0de5bf71829e3afcf9de74153d8147c705da 100644
>--- a/Tools/ChangeLog
>+++ b/Tools/ChangeLog
>@@ -1,3 +1,18 @@
>+2019-06-02  Darin Adler  <darin@apple.com>
>+
>+        Finish cleanup of String::number for floating point
>+        https://bugs.webkit.org/show_bug.cgi?id=198471
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * TestWebKitAPI/Tests/WTF/WTFString.cpp:
>+        (TestWebKitAPI::testStringNumber): Go back to calling String::number instead of
>+        String::numberToStringECMAScript.
>+
>+        * WebKitTestRunner/InjectedBundle/InjectedBundlePage.cpp:
>+        (WTR::dumpFrameScrollPosition): Use appendNumber instead of appendECMAScriptNumber
>+        since that is now the default.
>+
> 2019-05-31  Sihui Liu  <sihui_liu@apple.com>
> 
>         TestWebKitAPI.WKWebView.LocalStorageProcessSuspends is flaky
>diff --git a/Tools/TestWebKitAPI/Tests/WTF/WTFString.cpp b/Tools/TestWebKitAPI/Tests/WTF/WTFString.cpp
>index 7a057dcafda6664fade608d69f2efc6a412f6826..7ad2028f71a6aaa084385054b9ae03d8e204655b 100644
>--- a/Tools/TestWebKitAPI/Tests/WTF/WTFString.cpp
>+++ b/Tools/TestWebKitAPI/Tests/WTF/WTFString.cpp
>@@ -172,7 +172,7 @@ TEST(WTF, StringNumberFixedWidth)
> static inline const char* testStringNumber(double number)
> {
>     static char testBuffer[100] = { };
>-    std::strncpy(testBuffer, String::numberToStringECMAScript(number).utf8().data(), 99);
>+    std::strncpy(testBuffer, String::number(number).utf8().data(), 99);
>     return testBuffer;
> }
> 
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/InjectedBundlePage.cpp b/Tools/WebKitTestRunner/InjectedBundle/InjectedBundlePage.cpp
>index 4001f862b9c3156f33ca5388311c8908e4ddf312..dc9de166372dd0406445788a8c3c3ab80760162b 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/InjectedBundlePage.cpp
>+++ b/Tools/WebKitTestRunner/InjectedBundle/InjectedBundlePage.cpp
>@@ -782,9 +782,9 @@ static void dumpFrameScrollPosition(WKBundleFrameRef frame, StringBuilder& strin
>         stringBuilder.appendLiteral("' ");
>     }
>     stringBuilder.appendLiteral("scrolled to ");
>-    stringBuilder.appendECMAScriptNumber(x);
>+    stringBuilder.appendNumber(x);
>     stringBuilder.append(',');
>-    stringBuilder.appendECMAScriptNumber(y);
>+    stringBuilder.appendNumber(y);
>     stringBuilder.append('\n');
> }
>

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Attachments on bug 198471: 371172 | 371173