(original) (raw)

I'd like to propose a different approach to seeding the string hashes:

only do so for dictionaries involving only strings, and leave the

tp_hash slot of strings unchanged.



Each string would get two hashes: the "public" hash, which is constant

across runs and bugfix releases, and the dict-hash, which is only used

by the dictionary implementation, and only if all keys to the dict are

strings. In order to allow caching of the hash, all dicts should use

the same hash (if caching wasn't necessary, each dict could use its own

seed).



There are several variants of that approach wrt. caching of the hash

1. add an additional field to all string objects, to cache the second

� hash value.

� a) variant: in 3.3, drop the extra field, and declare that hashes

� may change across runs