`socket.socketpair`'s `type` parameter accepts `SocketType` on non-Windows

[gschaffner]

socket.socketpair's type parameter on non-Windows platforms is annotated SocketType | int:

typeshed/stdlib/socket.pyi

Lines 1411 to 1413 in cd8b26b

	def socketpair(
	family: int | AddressFamily | None = None, type: SocketType | int = ..., proto: int = 0
	) -> tuple[socket, socket]: ...

It seems like it should be SocketKind | int, similar to the type parameter of socket.socket and socket.fromfd:

typeshed/stdlib/socket.pyi

Lines 1319 to 1321 in cd8b26b

	def __init__(
	self, family: AddressFamily | int = -1, type: SocketKind | int = -1, proto: int = -1, fileno: int | None = None
	) -> None: ...

typeshed/stdlib/socket.pyi

Line 1396 in cd8b26b

def fromfd(fd: SupportsIndex, family: AddressFamily | int, type: SocketKind | int, proto: int = 0) -> socket: ...

Passing a SocketKind (e.g. socket.socketpair(type=SocketKind.SOCK_STREAM)) already works fine since SocketKind is an int subtype. I don't think that SocketType is supported though. There don't appear to be any paths in CPython where a SocketType is accepted; the only two paths are

• Pass the type: SocketType to socket.socket: https://github.com/python/cpython/blob/v3.14.2/Lib/socket.py#L659-L668, which blows up:

  Traceback (most recent call last):
   File "/tmp/tmp.SPNfuStkPY/eg.py", line 3, in <module>
   socketlib.socketpair(type=socketlib.socket())
   ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/home/ganden/.pyenv/versions/3.13/lib/python3.13/socket.py", line 659, in socketpair
   a, b = _socket.socketpair(family, type, proto)
   ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
  TypeError: 'socket' object cannot be interpreted as an integer
  

• Or blow up if type is anything but SocketKind.SOCK_STREAM:

  https://github.com/python/cpython/blob/v3.14.2/Lib/socket.py#L604-L613