A modern programming language that makes developers happier.

kotlinlang

what was the reason that the arity of function types maxed out at 22 originally? (before FunctionN). is there something special about 22 or was it arbitrary?

as far as I know, it's arbitrary, but curious. Scala also tops out at <https://www.scala-lang.org/api/current/scala/Function22.html|Function22>/<https://www.scala-lang.org/api/current/scala/Tuple22.html|Tuple22>/<https://www.scala-lang.org/api/current/scala/Product22.html|Product22>, with a similar array-based type-erased workaround for larger arities as <https://github.com/Kotlin/KEEP/blob/master/proposals/functional-types-with-big-arity-on-jvm.md|Kotlin's FunctionN>

yeah similarities between scala and kotlin there is what made me wonder

and all the KEEPs and such for functionN don't mention WHY the limit was 22

It's arbitrary. Kotlin just picked the number from Scala. Why Scala tops at 22 I don't know.