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森建 (moriken@social.kimamass.com)'s status on Friday, 15-Feb-2019 07:52:37 JST 森建

IE10 で typeof 演算子の結果 "unknown" が返ってくることがあるっていうの面白すぎるな。そして ChakraCore にその断片が残っていると……。
https://github.com/tc39/ecma262/issues/1440#issuecomment-461963872
In conversation Friday, 15-Feb-2019 07:52:37 JST from social.kimamass.com permalink
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  Implementation-defined typeof still necessary? · Issue #1440 · tc39/ecma262
  
  from GitHub
  
  Now that we have the HTML document.all object defined, including its typeof document.all = "undefined" behavior, do we still need to permit non-standard, non-callable exotic objects to ha...

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