Re: [RFC] new digest datatypes, or generic fixed-len hex types?

Alvaro Herrera <alvherre@commandprompt.com> writes:
> We've developed some code to implement fixed-length datatypes for well
> known digest function output (MD5, SHA1 and the various SHA2 types).
> These types have minimal overhead and are quite complete, including
> btree and hash opclasses.

> We're wondering about proposing them for inclusion in pgcrypto.

Wasn't this proposed and rejected before?  (Or more to the point,
why'd you bother?  The advantage over bytea seems negligible.)
        regards, tom lane