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This is probably a corner case that got missed in the
int/long convergence.  Still, is there a reason not to use
%.f when you know you are passing a float and want to
display it with no fractional component?

>>> '%.f' % 2**50 
'1125899906842624'

or %ld if you expect the range to exceed the integer limits of
your hardware?

>>> '%ld' % 2**50
'1125899906842624'

I agree the documentation could probably be improved
in this area.