Re: bytea bitwise logical operations implementation (xor / and / or / not)

Hi Fabien,

> I think that the probability of getting these useful things into pg is
> alas small. In the mean time, you may package and register it as an
> extension?
I aimed to close the asymmetry between bit vector operations (they also
offer xor/and/etc.) and bytea operations. My code is more or less a 1:1
copy of the corresponding bit vector operations (in fact, just a tiny
bit easier, since bytea is byte-aligned, wheres bit vectors aren't).

I just wanted to dump the code here, given that Tom suggested (in 2006)
such an implementation might be a useful addition to bytea. But I won't
feel offended in any way if the code won't be merged.