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Since commit 167a0edf, Set.WHICH now hashes the concatenated .WHICHes
of the set's elements, producing a fixed-size output. This inevitably
means that some sets that would otherwise have had distinct .WHICH values
will now clash. I can't give an example, because doing so would require
constructing a SHA-1 clash, but it is inevitable that clashes will occur
by this route. Since === on Sets follows .WHICH, it will perceive Sets
to be identical based on hash coincidences. The hashing means that ===
can only perceive 2**160 distinct Set identities.
This is distinct from the problem of Set.WHICH clashes arising from
distinct sets of element .WHICHes concatenating to the same string,
previously reported as [perl #128943].
Migrated from rt.perl.org#132033 (status was 'new')
Searchable as RT132033$
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