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Check for integer overflow for width and precision is buggy.
Just a few examples (on platform with 32-bit int):
>>> '%.21d' % 123
'000000000000000000123'
>>> '%.2147483648d' % 123
'123'
>>> '%.2147483650d' % 123
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: prec too big
>>> '%.21f' % (1./7)
'0.142857142857142849213'
>>> '%.2147483648f' % (1./7)
'0.142857'
>>> '%.2147483650f' % (1./7)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: prec too big