Hamming does not support bytea type

[harvimt]

Unfortunately there's a) no good way to convert between postgres's bytea type (variable length byte strings) and varbit (variable length bit strings) due to well, read the whole thread here: http://archives.postgresql.org/pgsql-patches/2006-05/msg00041.php

mostly seems to be endianness/arguments that byte strings and bitstrings aren't really the same thing, yadda, yadda,

Anyway, I'm gonna try to write a hamming_bytea function and submit a pull request, but we'll see how far I get before I realize I have no idea what I'm doing. Anyway, looks like you're treating "text" as a bytestring anyway, so I should be able to copy/paste that code somehow, or something, maybe.