why does socket.makefile require non-blocking mode?

[Forest]

The socket.makefile() docs say, "the socket must be in blocking mode."  I
don't see any explanation of why blocking mode is required, and I'm not sure
whether that means timeout mode is forbidden as well.  Can someone clarify
this?

I wanted to use file-like objects with socket timeouts, so I ended up writing
my own replacement for socket._fileobject.  I'd appreciate it if someone could
either explain to my why my new class was unnecessary, or else encourage me to
contribute it as a patch to the socket module.

Cheers,

Forest