Add LambertW
trait for evaluation of Lambert W function
#16
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This PR adds the
LambertW
trait for evaluation of the Lambert W function, and implements it forf64
by delegating to thelambert_w
crate.This partially implements #14, as it still lacks
f32
support.It currently does not support using the standard library instead of
libm
, since that would require disabling thestd
feature when this crate enabled theno_std
feature.