Might pick this up later today (or never), but taking a break for now.

Larry, I have patches for grp, spwd, _multibytecodec, and pwd I'd like you to give a once-over to make sure I didn't miss anything.

The only one that I think has an obvious improvement is in pwd where there is custom logic to deal with a PyArg_ParseTuple() failure. Does Argument Clinic have a way to specify custom logic in that instance?

With these patches the TODO for this derby group is:

    Modules/cmathmodule.c: 8 sites
    Modules/arraymodule.c: 27 sites
    Modules/pyexpat.c: 11 sites
    Modules/fcntlmodule.c: 4 sites

cmath might not be worth doing, though, for 3.4 as it already has custom macros to create function definitions.