[issue31980] Special case log(x, 2), log(x, 10) and pow(2, x)

[Mark Dickinson]

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

> There is no two-argument libm `log`. Two-argument log(x, base) is implemented as log(x) / log(base).

Yep. But log(x) / log(base) is monotonic in x for a fixed base, assuming that the libm log is. My objections still hold. :-) Please let's keep the math.log implementation simple (or at least, no more complicated than it already is).

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<https://bugs.python.org/issue31980>
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