My wisecrack about never upgrading to Scala 3 is really just a wisecrack.
I'm sure we'll eventually migrate because libraries we use will, and
because we'll eventually want the features ourselves to improve the code
base.
Also, new developers learning Scala will want to learn the latest flavor
To be sure, upgrading Daffodil from Scala 2.12 to Scala 2.13 is a prerequisite
and that upgrade will be as much work as the upgrade from Scala 2.13 to Scala
3.x so we're talking about two major efforts, not just one. If Daffodil users
are happy with Scala 2.12 and aren't requesting support for
