well we have a param already called `use_native_unicode`, which has the effect of using `psycopg2.extensions.UNICODE`, and this param is generally set.   Though im not quite sure we should link to hstore, does this prevent binary data from being retrieved from the hstore ?  or perhaps, what's the behavior with the non-native hstore, do we return unicode in that implementation?  ( I didn't write it, would have to check)