[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 #1 from Chris Dumez <cdumez at apple.com> ---
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.

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