Bug 239797

This is a JavaScriptCore analog of SpiderMonkey https://bugzilla.mozilla.org/show_bug.cgi?id=1484547 https://tc39.es/ecma262/multipage/ordinary-and-exotic-objects-behaviours.html#sec-addrestrictedfunctionproperties and https://tc39.es/ecma262/multipage/ordinary-and-exotic-objects-behaviours.html#sec-createunmappedargumentsobject specify that the getter and setter for each of `Function.prototype` "caller", `Function.prototype` "arguments", and strict-mode function body `arguments` "callee" should all be the same %ThrowTypeError% built-in function. However, JavaScriptCore returns a distinct value for all but the getter/setter pair for strict-mode `arguments` "callee": ```js (function(){ "use strict"; const inputs = [ ["Function.prototype `caller` getter", Object.getOwnPropertyDescriptor(Function.prototype, "caller").get], ["Function.prototype `caller` setter", Object.getOwnPropertyDescriptor(Function.prototype, "caller").set], ["Function.prototype `arguments` getter", Object.getOwnPropertyDescriptor(Function.prototype, "arguments").get], ["Function.prototype `arguments` setter", Object.getOwnPropertyDescriptor(Function.prototype, "arguments").set], ["arguments `callee` getter", Object.getOwnPropertyDescriptor(arguments, "callee").get], ["arguments `callee` setter", Object.getOwnPropertyDescriptor(arguments, "callee").set], ]; const groups = new Map(); for (let [label, fn] of new Map(inputs)) { const group = groups.get(fn) || groups.set(fn, []).get(fn); group.push(label); } return JSON.stringify([...groups.values()], null, 2); })() /* => [ [ "Function.prototype `caller` getter" ], [ "Function.prototype `caller` setter" ], [ "Function.prototype `arguments` getter" ], [ "Function.prototype `arguments` setter" ], [ "arguments `callee` getter", "arguments `callee` setter" ] ] */ ```