Implements num_traits::real::Real for NotNan<T> #176
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…oatCore Forwards the calls of Real trait methods to the underlying type, panicking when the result is NaN, as suggested in https://docs.rs/num-traits/latest/num_traits/real/trait.Real.html Also adds a few tests to ensure things actually panic when they should.
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This is the counterpart of the implementation of Float for OrderedFloat as Real is "A trait for real number types that do not necessarily have floating-point-specific characteristics such as NaN and infinity."
Operations that would result in a NaN cause a panic, as it is the behaviour that it suggested in the num_trait docs. Checks for NaN results are only done in cases where a NaN could be expected, and assumes that the implementation of Real for the underlying type is sane otherwise.