Custom serializer lookup is broken [API-1669] #591
Description
Reproducer:
class Foo:
pass
client = HazelcastClient()
m = client.get_map("test").blocking()
m.set("foo", Foo)
Fails with:
File "/home/yuce/Work/Projects/hazelcast-python-client/hazelcast/serialization/service.py", line 447, in lookup_custom_serializer
for super_type in obj_type.__subclasses__():
hazelcast.errors.HazelcastSerializationError: unbound method type.__subclasses__() needs an argument