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In the file socket_connection.c on line 139 a cast to Py_ssize_t is missing for the return value.
Is:
 return res < 0 ? res : ulength;
Should be
 return res < 0 ? (Py_ssize_t)res : (Py_ssize_t)ulength;
Now it can be possible that a close of the socket is not detected.
Found the bug by creating a server client that only sends the length of a data package and then closing the socket. 
Without the cast the calling function (connection_recvbytes in connection.h) will try to return an object because of not detecting the result was smaller then 0.