add warning to stub and c files; admin typing more

Author: fangnx

CONTRIBUTOR.md

@@ -91,7 +91,7 @@ class ConsumerGroupState(Enum):
     #: Consumer Group is empty.
     EMPTY = cimpl.CONSUMER_GROUP_STATE_EMPTY
 
-    def __lt__(self, other: 'ConsumerGroupState') -> Any:
+    def __lt__(self, other) -> Any:
         if self.__class__ != other.__class__:
             return NotImplemented
         return self.value < other.value
@@ -111,7 +111,7 @@ class ConsumerGroupType(Enum):
     #: Classic Type
     CLASSIC = cimpl.CONSUMER_GROUP_TYPE_CLASSIC
 
-    def __lt__(self, other: 'ConsumerGroupType') -> Any:
+    def __lt__(self, other) -> Any:
         if self.__class__ != other.__class__:
             return NotImplemented
         return self.value < other.value
@@ -167,7 +167,7 @@ class IsolationLevel(Enum):
     READ_UNCOMMITTED = cimpl.ISOLATION_LEVEL_READ_UNCOMMITTED  #: Receive all the offsets.
     READ_COMMITTED = cimpl.ISOLATION_LEVEL_READ_COMMITTED  #: Skip offsets belonging to an aborted transaction.
 
-    def __lt__(self, other: 'IsolationLevel') -> Any:
+    def __lt__(self, other) -> Any:
         if self.__class__ != other.__class__:
             return NotImplemented
         return self.value < other.value
@@ -186,7 +186,7 @@ class ElectionType(Enum):
     #: Unclean election
     UNCLEAN = cimpl.ELECTION_TYPE_UNCLEAN
 
-    def __lt__(self, other: 'ElectionType') -> Any:
+    def __lt__(self, other) -> Any:
         if self.__class__ != other.__class__:
             return NotImplemented
         return self.value < other.value