"()" format string creates an empty list of argument but requires extra work to
parse the format string.

PyType_Ready() sets the reference to &PyType_Type.

&PyType_Type cannot be resolved at compilation time (not on Windows?).

This implementation provides additional 10-20% speed boost for
asyncio programs.

The patch also fixes _asynciomodule.c to use Arguments Clinic, and
makes '_schedule_callbacks' an overridable method (as it was in 3.5).

from lib-dynload on install.

special input values as literal text.

special input values as literal text.

PyUnicode_AsDecodedObject(), PyUnicode_AsDecodedUnicode() and
PyUnicode_AsEncodedUnicode().

PyUnicode_AsEncodedObject() in _curese to ensure that the result
is a bytes object.

PyUnicode_AsEncodedObject() in _curese to ensure that the result
is a bytes object.