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As it turns out, the speed gained by lowering the number of digits in
divisor using repeated division is much less than the speed gained by
using multiplication of the dividend instead of division of divisor.
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There are now 2 features that control the amount of precomputed
constants. They can either be 0, 12, or 256. Most users will likely want
to go with the 12, so this is the default feature.
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It seems English doesn't use the word potency in this context, but
rather uses power.
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The maximum power of the base that can fit into a given data type is
constant. There's no point in computing it at runtime, if we can just
store it in a compile-time constants array.
The code isn't the most beautiful, but that's mostly because Rust const
functions are still a bit limited.
One function was duplicated, because it was easy to get a slow version
to compile in const context, and const context doesn't really care...
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Speeds up the 20 and 32 byte cases. Has slightly negative impact for 16
byte case.
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