[jQuery] getElementsByTagName('*') avoidance?

[jQuery] getElementsByTagName('*') avoidance?

Is there any supported jQuery platform or situation where
context.getElementsByTagName('*') does not get all the elements in the
context? Right now the jQuery selector code avoids using it and instead does
a recursive crawl of the tree, which has to be a lot more expensive. I know
it wasn't there in IE5, but I think we've given up on IE5 support.
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