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Patch to follow.
Created an attachment (id=62551) [details]
[PATCH] Proposed fix.
(From update of attachment 62551 [details])
Committing to http://svn.webkit.org/repository/webkit/trunk ...
http://trac.webkit.org/changeset/64040 might have broken Qt Linux Release minimal
Which value was breaking this such that !! fixed the problem?
(In reply to comment #5)
> Which value was breaking this such that !! fixed the problem?
I guess it was object with no own property names:
type === "object" && object !== null && (Object.getOwnPropertyNames(object).length || object.__proto__)) || type === "function"
evaluated to "object.__proto__" that was non-boolean. Then proto was serialized which was wrong thing to do...