JuliaLang / julia / #37014

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Implement `modf` in Julia (#42392)

Currently `modf` calls into libm, and is one of the few remaining
holdouts that use libm. This commit reimplements it in Julia using a
simple, naive implementation that matches the IEEE behavior and has
performance on par with a port of the musl implementation and with the
existing implementation.

Co-Authored-By: Simon Byrne <simonbyrne@gmail.com>
Co-Authored-By: woclass <wo@wo-class.cn>

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