The limits of 22 for the maximal number of parameters of function types and the maximal number of fields in tuple types have been dropped.
Functions can now have an arbitrary number of parameters. Functions beyond Function22 are erased to a new trait
scala.FunctionXXL and tuples beyond Tuple22 are erased to a new trait
scala.TupleXXL. Both of these are implemented using arrays.
Tuples can also have an arbitrary number of fields. Furthermore, they support generic operation such as concatenation and indexing.