[issue3724] math.log(x, 10) gives different result than math.log10(x)

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Note that log2(int) -> float wouldn't entirely replace
numbits, due to loss of precision in the result.

e.g.  log2(2**100), log2(2**100+1) and log2(2**100-1) would likely all
return exactly the same result (100.0), where numbits wants results of 
101, 101 and 100 respectively.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3724>
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