222526 2021-02-28 00:55:50 -0800 [JSC] Default constructor definition is changing 2021-03-07 00:56:13 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified NEW InRadar P2 Normal --- 1 ysuzuki webkit-unassigned ashvayka webkit-bug-importer ysuzuki oldest_to_newest 1734264 0 ysuzuki 2021-02-28 00:55:50 -0800 https://github.com/tc39/ecma262/pull/2216 1734265 1 ysuzuki 2021-02-28 00:57:50 -0800 https://github.com/tc39/ecma262/issues/2212 Interesting. 1734267 2 ysuzuki 2021-02-28 01:32:30 -0800 We should introduce @tailConstructForwardArguments. function() { return @tailConstructForwardArguments(@getPrototypeOf(@callee)), this); } Why can it happen? We do not need to check |this| when finishing this constructor since 1. we can ensure that we are always calling the super 2. we can ensure that we call super only once 1734269 3 ysuzuki 2021-02-28 01:59:12 -0800 In this way, we can completely eliminate allocation for this default constructor, which is good ;) 1736906 4 webkit-bug-importer 2021-03-07 00:56:13 -0800 <rdar://problem/75143301>