Serhiy Storchaka: "Is this function publicly documented? If this is true, it should first be deprecated."

It's not documented, but I found a reference in the documentation:
---
try:
    from socket import socketpair
except ImportError:
    from asyncio.windows_utils import socketpair
---

This code continues to work on Python 3.5 and newer, the "except" block will just never be taken.


> It is left in the __all__ list.

Oops, fixed in my PR.