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Thanks for your comments.  It made a lot more sense after I
finished reading your blog.  

I think the signed-ness issues which relate to ("i",
unsigned int) or ("l", unsigned long) should be fixed.  I
agree with your concern about fixing and backporting, though
I don't know how best to address it.

I'm not concerned about unsigned vs signed char * for 's'
and 't' formats.  I don't think they are a big deal which we
seem to agree on.

I fixed the bltinmodule.c:1910 problem.  That wasn't really
an issue since the variable was larger and not actually
used.  The problem with xxmodule.c:207 is in error checking
code, so I'm not concerned about that.  (It's checking that
O# is invalid.)

Can you run your script on Objects too?  It would be great
if we got your script into the python tree too so we can
search for these things in the future.  (Ideally we would
have complete unittests, but I'm not holding my breath for
that to happen.)

For the record is your name Michael Urman?  I would like to
add you to the ACKS file.