How Web Standards Work 1. design a flawed API (it's fine! APIs are hard) 2. ship it in the most-used browser, despite objections 3. get cross-browser working group to fix the API 4. oops, too late, that would break the webpic.twitter.com/IuU6Xxzilv
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Of course that's not actually an issue in the semantics Chrome implements for FrozenArray, which don't match the IDL spec for FrozenArray. No one else implements FrozenArray at all. And saying "the API shape webidl recommends" while implementing something else is odd too. ;)
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