Say I have an API that takes a callback, and I have two functions, one for callbacks with arguments and one for nullary callbacks. I must do it this way. What naming choice would you use to distinguish the two variants? I feel like "nullary" is obscurantist

@mcc "nullary" seems like the common term for it though?

https://en.wikipedia.org/wiki/Arity

but i guess "0-ary" could also work, since we have "n-ary"

Arity - Wikipedia