[Webkit-unassigned] [Bug 38557] r58526 introduced a ~30% regression on Dromaeo JS lib

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=38557





--- Comment #14 from Darin Adler <darin at apple.com>  2010-05-06 15:13:17 PST ---
(In reply to comment #13)
> BTW, Darin, do you remember why it was decided that we need to retain cached
> node lists as long as node is alive?  I remember it was due to failing layout
> tests, but is it indeed desired semantics?
> 
> I'll check tomorrow HTML5 wording, but any insights are most appreciated.

The general principle is that garbage collection must not be detectable. So if
someone adds custom properties to a node list it’s important we don’t lose
those. That’s the main concept. The rest is just about performance tuning, I
suppose.

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