Mark Dickinson <dicki...@gmail.com> added the comment:

+1. This is part of C99, so if it's also supported by Visual Studio, then this 
seems like a no-brainer. If it's _not_ also supported by Visual Studio, or if 
there are implementations that have serious numerical problems (as was the case 
with fma) we'll need to write our own fallback implementation, which is less 
simple.

In principle it should be relatively easy for a math library to provide a 
correctly-rounded cbrt.

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<https://bugs.python.org/issue44357>
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