Note also that hash lookups are, worst case, Θ(N). There's always a chance that all hash keys map to the same value, resulting in a linear list that needs to be searched.
I recall that perls from 5.8.3 or so have code in place to watch out for this sort of degenerate case, and will rehash to prevent this from occurring.
• another intruder with the mooring in the heart of the Perl
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