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

working with binary is certainly lacked in Postgres.

I would be happy if these can be pulled in to Postgres, as there's not always a possibility to install a C based extension, and bit tricks are needed for efficient SQL-level implementations of custom datatypes.

Another bitwise thing,  when I was implementing a custom interval type, I lacked a way to set bits from i to j in bit vector. It's probably doable with clever and-or-xor tricks, but that would imply a lot of allocations of temporary bit vectors.

For reference, it was subset of OpenStreetMap opening_hours spec implementation.
Implementation I came up with:

https://github.com/gojuno/lostgis/blob/master/sql/types/type_opening_hours.sql 

Spec:
https://wiki.openstreetmap.org/wiki/Key:opening_hours