I agree with Rico: apparently both Safari and FF just started to follow
ECMA-262, so we could just remove the comment. And maybe even the condition
itself, if the rest of the code works fine for this case, which easily
could be
the case (I hope it's a rare case and we shouldn't keep this condition as an
optimization).
BTW, couple of lines below there is a special treatment of missing delete
count.
I wonder if Safari or FF changed their behaviour as well (probably not for
FF
as it wasn't the case for TraceMonkey).
http://codereview.chromium.org/3277005/show
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