[issue35913] asyncore: allow handling of half closed connections

[Giampaolo Rodola']

Giampaolo Rodola' <g.rodola at gmail.com> added the comment:

> When recv() return 0 we may still have data to send.

It seems recv() returning b"" is an alias for "connection lost". E.g. in Twisted:
https://github.com/twisted/twisted/blob/06c891502be9f6389451fcc959cad5485f55d653/src/twisted/internet/tcp.py#L227-L248

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