Trevor Gross
f9aeb48c51
As we port more correctly rounded implementatinos from CORE-MATH, it
would be nice to keep the existing versions around since they are
simpler, typically smaller and faster, and easier to port to other float
types. The implementations have also been reasonably well tested.
Introduce an `approx` module that will serve as a home for these. As the
first member, add back the old `cbrt` implementation that was replaced
in 75a7f3df3ed7 ("Port the CORE-MATH version of `cbrt`").
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