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c0cd29ed66
improve float to_degrees/to_radians rounding comments and impl This PR makes `to_degrees()` and `to_radians()` float functions more consistent between each other and improves comments around their precision and rounding. * revise comments explaining why we are using literal or expression * add unspecified precision comments as we don't guarantee precision * use expression in `f128::to_degrees()` * make `f64::to_degrees()` impl consistent with other functions r? `@tgross35`