[issue20951] SSLSocket.send() returns 0 for non-blocking socket

[Antoine Pitrou]

Antoine Pitrou added the comment:

> There's a great saying in the usability world: "You can't document 
> your way out of a usability problem".

However, adding a flag to change behaviour at runtime creates *another* usability problem. It's not obvious it would actually make things better (and implementors of async networking frameworks haven't asked for it, AFAICT).

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