Natural logarithm of 10.
The natural logarithm of 10 is the number such that pow(E, LN10) == 10. This value is not exact, but it is the closest representable double to the exact mathematical value.
const double ln10 = 2.302585092994046
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https://api.dartlang.org/stable/2.0.0/dart-math/ln10-constant.html