It's been a couple of years since I asked about this function.
Is it still in the works?
Yes, it is.
I'll check what's going on with that function family, I remember there being some obstacles but if I am not mistaken, most were removed over time and the only function that remains blocked is the one that computes the area, others can perhaps go. I'll untangle computing length from computing area if this is the case (and if not, I'll see what's the hold up and try to bump the priority of that).