fix(eval): use our own frexp to implement std.exponent and std.mantissa
#20
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…antissa` Some implementations of `f64::log2` are too inaccurate for this purpose. The new `frexp` implementation operates on the bit representation of the floating point numbers, so it is less subject to platform-dependent floating point weirdness.
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Some implementations of
f64::log2are too inaccurate for this purpose. The newfrexpimplementation operates on the bit representation of the floating point numbers, so it is less subject to platform-dependent floating point weirdness.