Tom Lane wrote:
The latter.  By the time you pay the price of a hash lookup, a slightly
longer key is nearly free.  (Maybe entirely free, since it might produce
better-distributed hash values.)

OK -- I figured that's what you'd say, so I've already started down that road.

dynahash only supports fixed-length keys, so don't forget to zero out
unused positions in the argument type vector.

Important safety tip! Thanks.

BTW, I can't see any need to include the return type in the hash key ---
wouldn't it be predetermined given the argument types?

Yup, very true.



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