checklist for 2024.04

[coke]

• Improvements:

  • Make X::Syntax::Number::LiteralType a subclass of
    X::TypeCheck::Assignment [5b7cf94c]
  • Make Rakudo up to 2x as fast on the JVM backend by using fastutil [05aae712][23a9fdbe]
    [955bc856]

• Additions:

  • Add Allomorph.narrow [e6a28e1c]
  • Add dispatch disambiguation via 'is item' parameter trait [70f16f63]
    [3b42de18][36901bb0][0ce55752][c02bd131]