asyncio: start_tls() can return None (#10346)

Author: Dreamsorcerer

stdlib/asyncio/base_events.pyi

@@ -263,7 +263,7 @@ class BaseEventLoop(AbstractEventLoop):
             server_hostname: str | None = None,
             ssl_handshake_timeout: float | None = None,
             ssl_shutdown_timeout: float | None = None,
-        ) -> Transport: ...
+        ) -> Transport | None: ...
         async def connect_accepted_socket(
             self,
             protocol_factory: Callable[[], _ProtocolT],
@@ -317,7 +317,7 @@ class BaseEventLoop(AbstractEventLoop):
             server_side: bool = False,
             server_hostname: str | None = None,
             ssl_handshake_timeout: float | None = None,
-        ) -> Transport: ...
+        ) -> Transport | None: ...
         async def connect_accepted_socket(
             self,
             protocol_factory: Callable[[], _ProtocolT],

stdlib/asyncio/events.pyi

@@ -358,7 +358,7 @@ class AbstractEventLoop:
             server_hostname: str | None = None,
             ssl_handshake_timeout: float | None = None,
             ssl_shutdown_timeout: float | None = None,
-        ) -> Transport: ...
+        ) -> Transport | None: ...
         async def create_unix_server(
             self,
             protocol_factory: _ProtocolFactory,
@@ -418,7 +418,7 @@ class AbstractEventLoop:
             server_side: bool = False,
             server_hostname: str | None = None,
             ssl_handshake_timeout: float | None = None,
-        ) -> Transport: ...
+        ) -> Transport | None: ...
         async def create_unix_server(
             self,
             protocol_factory: _ProtocolFactory,