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Issues I've run into, and would like pre-patch feedback:

Regarding signed/unsigned in general - is it python-code
safe to change a signed format to an unsigned? Reading
getargs.c it looks like bounds are only checked for the
signed formats. This could be either good or bad.

fcntlmodule.c: the reported char* type of arg on line 174 is
due to a shadow variable (already scoped-out) earlier in the
function. Is this worth changing?

xxmodule.c: the use of # with a long is preceded by a
comment about testing bad format characters. I'm unconvinced
whether this is what it meant.