> WRT boolean for SSL, I think it's very common for clients to verify server certificates, but relatively uncommon for servers to require client certificates.  The impression I have from reading docs and stack overflow posts that the most common use case for the SSL module is connection to HTTPS sites. For this use case, using a default context makes a lot of sense.

> It seems extremely unlikely to me for a server to use a default context.

I think in this case we should just mimic the API of create_server and create_unix_server.

As for restricting socket family type - I think Guido is right.  Although I'd love uvloop to be 100% compatible, I guess we shouldn't add artificial restrictions: if asyncio already supports AF_BLUETOOTH then let's keep it that way.