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I think that the X prefix only applies to macros.  AFAIK there are no 
Python *functions* that use the X prefix, but most of them check input.  I 
am not using the MACRO CAPITALIZATION, so I don't think I should need 
to use XMACRO XPREFIXES either.  They're ugly.

sjoerd clearly explains why I chose the X versions in his comment below.  

In short, I think it's a bad idea to functionify Py_(INC|DEC)REF, but I don't 
want to pay the XPENALTY for making the right choice.