they are just internal implementation details a developer is not likely to know what they are or what significance they have
Pull request: https://github.com/WebKit/WebKit/pull/2457
Committed 252554@main (ebb980b89e94): <https://commits.webkit.org/252554@main> Reviewed commits have been landed. Closing PR #2457 and removing active labels.
<rdar://problem/97166342>