2.) 6.17.23 FISHER transformation
Beyond the fact that the name is easily misinterpreted as the
gold-standard test for count-data (the FISHER-Exact test), the formula
is most certainly wrong. IF I read it correctly ((1-r)/(1-r), which
would be 1), then this has to be wrong, and it should be (1+r)/(1-r).

The same applies to the FISHERINV function.

I would strongly suggest to change the names of these functions to
something like TRANSFISHER() and TRANSFISHERINV(). You may want to
implement later the Fisher-exact test and it makes sense to have this
name for that test.