2013/9/19 Brendan Eich <[email protected]> > Refactoring [[Get]]+[[Call]] to [[Get]]+[[Invoke]] seems fine by me. It >> better expresses the intent, and the change should only be observable to >> proxies. >> > > Is this so? Wouldn't an ordinary object with a getter be able to observe > the two lookups? Indeed wouldn't the spec require this?
You're right. The change would lead to observably different behavior for conditionally invoked getters. Not sure how much of a backwards compat issue that would be. Allen previously wrote upstream in this thread: There are currently 6 such places (not counting the Proxy trap invocators): > 3 in ToPrimitive (ie toSrting/valueOf) > 1 in instanceof to access @@hasInstance (legacy conpat. for missing > @@hasInstance) > 1 in [ ].toString to conditionally invoke 'join' method > 1 in JSON.stringify conditionally invoke 'toJSON' How likely is it that these are getters with side-effects?
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