Add __hash__ dunder to PartialUser

Author: EvieePy

twitchio/user.py

@@ -113,6 +113,9 @@ def __eq__(self, other: object) -> bool:
 
         return self.id == other.id
 
+    def __hash__(self) -> int:
+        return hash(self.id)
+
     @property
     def mention(self) -> str:
         """Property returning the users display_name formatted to mention them in chat.