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_ifmt needs a buffer of at least 88 characters.  here's my calculation
%b is the worst case, and the largest integer is 64 bits.  at 1 char per bit,
this is 64 characters.  if %,b is used, we need 64/3 = 21 characters for
the commas.  %#,b requires two more characters.  one addn'l character
is required for %#+,b.  so this makes 64 + 21 + 2 + 1 = 88 characters.

- erik

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