change sismember return type (#2813)

Author: dvora-h

redis/client.py

@@ -820,7 +820,7 @@ class AbstractRedis:
         # **string_keys_to_dict(
         #     "COPY "
         #     "HEXISTS HMSET MOVE MSETNX PERSIST "
-        #     "PSETEX RENAMENX SISMEMBER SMOVE SETEX SETNX",
+        #     "PSETEX RENAMENX SMOVE SETEX SETNX",
         #     bool,
         # ),
         # **string_keys_to_dict(

redis/commands/core.py

@@ -3339,9 +3339,13 @@ def sinterstore(
         args = list_or_args(keys, args)
         return self.execute_command("SINTERSTORE", dest, *args)
 
-    def sismember(self, name: str, value: str) -> Union[Awaitable[bool], bool]:
+    def sismember(
+        self, name: str, value: str
+    ) -> Union[Awaitable[Union[Literal[0], Literal[1]]], Union[Literal[0], Literal[1]]]:
         """
-        Return a boolean indicating if ``value`` is a member of set ``name``
+        Return whether ``value`` is a member of set ``name``:
+        - 1 if the value is a member of the set.
+        - 0 if the value is not a member of the set or if key does not exist.
 
         For more information see https://redis.io/commands/sismember
         """