create_datagram_endpoint expects a str when family=AF_UNIX (#9574)

Since python 3.7, asyncio.loop.create_datagram_endpoint expects the
arguments `local_addr` and `remote_addr` to be `str` or `None` when the
argument family=`socket.AF_UNIX` and the argument `sock` is `None` or
also a unix socket.

Author: gandalf3

stdlib/asyncio/base_events.pyi

@@ -342,8 +342,8 @@ class BaseEventLoop(AbstractEventLoop):
         async def create_datagram_endpoint(  # type: ignore[override]
             self,
             protocol_factory: Callable[[], _ProtocolT],
-            local_addr: tuple[str, int] | None = None,
-            remote_addr: tuple[str, int] | None = None,
+            local_addr: tuple[str, int] | str | None = None,
+            remote_addr: tuple[str, int] | str | None = None,
             *,
             family: int = 0,
             proto: int = 0,
@@ -356,8 +356,8 @@ class BaseEventLoop(AbstractEventLoop):
         async def create_datagram_endpoint(
             self,
             protocol_factory: Callable[[], _ProtocolT],
-            local_addr: tuple[str, int] | None = ...,
-            remote_addr: tuple[str, int] | None = ...,
+            local_addr: tuple[str, int] | str | None = ...,
+            remote_addr: tuple[str, int] | str | None = ...,
             *,
             family: int = ...,
             proto: int = ...,

stdlib/asyncio/events.pyi

@@ -495,8 +495,8 @@ class AbstractEventLoop:
     async def create_datagram_endpoint(
         self,
         protocol_factory: Callable[[], _ProtocolT],
-        local_addr: tuple[str, int] | None = None,
-        remote_addr: tuple[str, int] | None = None,
+        local_addr: tuple[str, int] | str | None = None,
+        remote_addr: tuple[str, int] | str | None = None,
         *,
         family: int = 0,
         proto: int = 0,