Use == operator for integer comparison.

jussi/upstream.py

@@ -123,7 +123,7 @@ class _Upstreams(object):
     @functools.lru_cache(8192)
     def timeout(self, request_urn) -> int:
         _, timeout = self.__TIMEOUTS.longest_prefix(str(request_urn))
-        if timeout is 0:
+        if timeout == 0:
             timeout = None
         return timeout