improve precision of float.to_precision
#785
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significantly improve the precision when rounding with a positive precision. while factors greater than one can be accurately represented up to a large number (10, 100, 1000, ...), even a factor of 0.1 already introduces inaccuracies, since 0.1 cannot be accurately represented using floating-point numbers.
The added test cases show this behaviour; one of them always fails if both branches of the
casewere the same.~ 💜