A helper crate for num-format that only exists because num-format on Windows requires
bindgen as a build dependency, which, if not broken out into a separate crate, would
prevent num-format from being built in a
no_std environment (build dependendies cannot
currently be made contingent on the compilation target).
Said differently, don't use this crate directly. It's just a work-around for https://github.com/rust-lang/rust-bindgen/issues/1439.