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The problem is that _socketobject.close fails to set
recv_into and recvfrom_into to _dummy.

The real problem seems to me that close relies on 
refcounting to close the underlying socket object. I think 
it should first call self._sock.close() before releasing
it.

Also, a test case should be added that the socket object
really does go away after close, e.g. in the form

 native_socket = s._sock
 s.close()
 assert sys.getrefcount(native_socket) == 2