[Webkit-unassigned] [Bug 187386] Sometimes "x instanceof Worker" inappropriately returns false

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187386

--- Comment #2 from Chris Dumez <cdumez at apple.com> ---
(In reply to Chris Dumez from comment #1)
> One common way this happens is when the page's JavaScript messes with the
> Worker's prototype chain in some way (so Worker or EventTarget). Some script
> does this to extend the API of a particular type.

To be clear, unless we have specific evidence (reproduction case), my instinct would be to say that this is an issue with the page's script, not WebKit. We've investigated many instances of this in the past and every time, it was the page's script modifying the prototype chain in some way.

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