Plan C is to add a per hash flag to say if the flag is using a non-standard hash function. This defaults to off (ie standard hash function). So normally nothing extra happens (except for 1 extra flag check)
Any hash that is flagged as non-standard hashing throws away any passed in pre-computed hash, and rehashes using the custom function. (which will be the same for all custom hashes - the algorithm as of 5.8.1 with the random seed). All this rehashing happens entirely in hv.o, so we have plan A behaviour there.
Umm... so what happens if something external has snagged the old hash value and the split/recalculate happens?
-- Alan Burlison --
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