fix: Option type handling for multiple Literals

Updates Option type resolution to return a Union of Literals when all filtered types are Literal, ensuring correct type annotation for command options.

Author: Lulalaby

discord/commands/options.py

@@ -386,8 +386,9 @@ def _strip_none_type(input_type):
                 raise TypeError("Option type cannot be only NoneType")
             if len(filtered) == 1:
                 return filtered[0]
-            return filtered
-
+            if all(getattr(t, "__origin__", None) is Literal for t in filtered):
+                return Union[filtered]
+            return Union[filtered]
         return input_type
 
     def to_dict(self) -> dict: