[Python-Dev] Special-casing "O"

[Tim Peters]

I don't want to see us duplicate the guts of PyArg_ParseTuple() inside
do_call_special().  METH_O is a cool idea, METH_l is marginal, and the new
code is already slower for METH_O than it needs to be in order to support
the *possibility* of METH_l too (stacks and loops and switch stmts and an
extra layer of do_call_special function call "just in case").

Do METH_O, convert every "O" function to use it, declare victory, and enjoy
the weekend <wink>.

1%-of-the-work-for-80%-of-the-gain-and-an-overall-decrease-in-code-
    size-ly y'rs  - tim