Why does the Scala library only defines tuples up to Tuple22?

Question

I\'m curious if anyone knows why the Scala library stops at 22 with its tuple type Tuple22?
Does the mysterious number 22 have a s

Answer 1

Limit 22 is one of the dropped features of dotty (Scala 3) which now allows tuples of arbitrary arity:

The limits of 22 for... the maximal number of fields in tuple types have been dropped... tuples beyond Tuple22 are erased to a new trait scala.TupleXXL.

For example,

object Main {
  def main(args: Array[String]): Unit = {
    val tuple: Tuple = ("1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25")
    println(tuple.getClass)
    println(tuple.size)
  }
}

outputs

class scala.TupleXXL
25

For further examples see Add tests for the current tuple API #7633