TypeError: sequence item 0: expected string in users_get_by_tenant_get_page

When calling: /v2.0/tenants/2/users?fresh=1316729221.29

I get the following error:

root : ERROR sequence item 0: expected string, long found
Traceback (most recent call last):
  File "/opt/keystone/keystone/utils.py", line 62, in check_error
    return func(*args, **kwargs)
  File "/opt/keystone/keystone/controllers/user.py", line 69, in get_tenant_users
    tenant_id, marker, limit, url)
  File "/opt/keystone/keystone/logic/service.py", line 328, in get_tenant_users
    limit)
  File "/opt/keystone/keystone/backends/sqlalchemy/api/user.py", line 260, in users_get_by_tenant_get_page
    filter("id in ('%s')" % "','".join(user_ids)).\
TypeError: sequence item 0: expected string, long found

Patch to follow