self._ids is expected to be a tuple instance, using that on SQL queries
will raise a `psycopg2.ProgrammingError: syntax error at or near "ARRAY"`.
Add test.
On 9af8b31d921dcccb7bcf230271fd3ef4R4329, a new keyword argument was added
for `_browse`, so any overriding needs to add that argument, as it's the case
for this module.