[Webkit-unassigned] [Bug 222228] postMessage changes prototype of basic types

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222228

--- Comment #6 from Chris Dumez <cdumez at apple.com> ---
(In reply to Chris Dumez from comment #5)
> Indeed, I see this in STP 120:
> [Log] is Object before postMessage?:  – true
> (iframeConsoleRunner-
> 7f4d47902dc785f30dedcac9c996b9f31d4dfcc33567cc48f0431bc918c2bf05.js, line 1)
> [Log] is Array before postMessage?:  – true
> (iframeConsoleRunner-
> 7f4d47902dc785f30dedcac9c996b9f31d4dfcc33567cc48f0431bc918c2bf05.js, line 1)
> [Log] is Object after postMessage?:  – false
> (iframeConsoleRunner-
> 7f4d47902dc785f30dedcac9c996b9f31d4dfcc33567cc48f0431bc918c2bf05.js, line 1)
> [Log] is Array after postMessage?:  – false
> (iframeConsoleRunner-
> 7f4d47902dc785f30dedcac9c996b9f31d4dfcc33567cc48f0431bc918c2bf05.js, line 1)
> 
> and this in my System Safari:
> [Log] is Object before postMessage?:  – true (xxRLPKp, line 52)
> [Log] is Array before postMessage?:  – true (xxRLPKp, line 53)
> [Log] is Object after postMessage?:  – true (xxRLPKp, line 45)
> [Log] is Array after postMessage?:  – true (xxRLPKp, line 46)
> 
> I will bisect.

Never mind, I am not actually seeing a recent regression. The difference I saw was before and after a reload.

If I load https://codepen.io/sechel/pen/xxRLPKp, I see:
[Log] is Object before postMessage?:  – true 
[Log] is Array before postMessage?:  – true 
[Log] is Object after postMessage?:  – true 
[Log] is Array after postMessage?:  – true 

If I press the reload button, I see:
[Log] is Object before postMessage?:  – true 
[Log] is Array before postMessage?:  – true 
[Log] is Object after postMessage?:  – false 
[Log] is Array after postMessage?:  – false 

I see this behavior in STP 120 as well as in older WebKit builds...

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