Antoine Pitrou <pit...@free.fr> added the comment:

[Martin's approach]
> The point I first missed is that this triggers only when the hash is
> *fully* equal; if the hashes are merely equal after masking, then
> today's try-another-slot approach will still be used, even for
> strings.

But then isn't it vulnerable to Frank's first attack as exposed in
http://mail.python.org/pipermail/python-dev/2012-January/115726.html ?

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