On py2 objects are printed via their .tp_repr slot with flags=0
(contrary to Py_PRINT_RAW which requests to print str -
https://docs.python.org/2.7/c-api/object.html#c.PyObject_Print)

We were not handling repr'ing inside our tp_print implementation, and
as the result e.g. b('мир') was printed on interactive console as
'\xd0\xbc\xd0\xb8\xd1\x80' instead of b('мир').

Fix it.