boolean query parameters inconsistently handled

The code which handles interpreting boolean query parameters (which are always converted to strings as part of the request) seems overly restrictive, it will only except "blah?parameter=0" as a definition of False, and not the (arguably more intuitive) "blah?parameter=False"

For example, trying to use the domain "enabled" filter:

# curl -i -X GET -H 'X-Auth-Token: 27c9fcf8c0404de0b15f33e11208bdda' -H 'Content-Type: application/json' -H 'Accept: application/json' http://127.0.0.1:5000/v3/domains?enabled=0
HTTP/1.1 200 OK
Vary: X-Auth-Token
Content-Type: application/json
Content-Length: 102
Date: Thu, 09 Jan 2014 16:37:29 GMT

{"domains": [], "links": {"self": "http://localhost:5000/v3/domains", "previous": null, "next": null}}

# curl -i -X GET -H 'X-Auth-Token: 27c9fcf8c0404de0b15f33e11208bdd -H 'Content-Type: application/json' -H 'Accept: application/json' http://127.0.0.1:5000/v3/domains?enabled=False
HTTP/1.1 200 OK
Vary: X-Auth-Token
Content-Type: application/json
Content-Length: 536
Date: Thu, 09 Jan 2014 16:37:35 GMT

{"domains": [{"links": {"self": "http://localhost:5000/v3/domains/b10fcb438ed048ada48036c25f8a45de"}, "enabled": true, "description": "Owns users and tenants used by the heat service", "name": "heat", "id": "b10fcb438ed048ada48036c25f8a45de"}, {"links": {"self": "http://localhost:5000/v3/domains/default"}, "enabled": true, "description": "Owns users and tenants (i.e. projects) available on Identity API v2.", "name": "Default", "id": "default"}], "links": {"self": "http://localhost:5000/v3/domains", "previous": null, "next": null}}

So passing enabled=False returns all the results for enabled=True, which is, uh, confusing, particularly since True/False works when specifying enabled in the body when creating a domain.

The problem is here:
https://github.com/openstack/keystone/blob/master/keystone/common/controller.py#L321