couple of windows bugs inherited from vanilla
- the expr object could not be instantiated when calling 'atanh'
such as in [expr atanh($f1)]
there might be other functions in expr that happen to also be bugged
'nan' is printed as "1.#QNAN' 'inf' is printed as "1.#INF"
all of which are plainly printed as 'nan'/'inf' on MacOS
if this is fixed, can we have a patch to send to vanilla as well as a merge request? cause this is something that also needs fixing upstream