Faulty rtype in docstring

[schwobaseggl]

The rtype annotation in KeycloakUMA.resource_set_create is wrong, or at least incomplete. It indicates that the return value will be a str when KeycloakClient._handle_response tries to return a deserialized json object.

This can be confusing/annoying when you try to maintain proper type annotations in a large project and your IDE tells you something is wrong. The UMA specs for that particular endpoint also state that the response should be some json with an "_id" key which (translated to Python) the function does return.