Regarding your update:

Thanks, very interesting! :)

Please pardon my C ignorance, but AFAIS is the second hashing version operating on the pointer to the key's string not the string itself.

Right?

This would have 3 consequences

• the randomization to avoid DoS attacks is based on the assumption that these pointers are not deterministic
• the keys are indeed mutable, as long as the new key fits into the allocated space of the old one -I. E. is shorter.
• memory management guarantees that those pointers are constant.° Last time I worked "close to the metal" MMUs were only an exotic feature allowing virtual addresses.

  I suppose all Perl ports control this issue?

  Like integrity of the hash after being swapped?

°) or the function is stable modulo memory page boundaries. But this might make then predictable again

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