On Sat, Aug 14, 2021 at 09:19:49AM +0000, Zelphir Kaltstahl wrote:
> Hi Tomas!
> 
> Ultimately I need the minimum and maximum arity of functions [...]

It seems that the second number in `procedure-minimum-arity's result
is the number of optional arguments (cf. `define*'). Since Guile 2.0,
optional args are in the core.

So that still might fit your bill. Or perhaps not ;-)

Cheers
 - t