This includes the following "breaking" changes to be aware of:

- The syntax '5.' (a lone trailing decimal point) is no longer
  supported for floating points.  Use '5.0' instead. (It is not
  deemed worth it to carry the lexer just for this!)
- The "int_literal" and "float_literal" node types are collapsed
  into just "num_literal". (Due to LR grammar in TS, we have to
  collapse to avoid false early matches for integer.)
- The "i" suffix for imaginaries is not supported (it is deprecated
  in D since at least 2.101, and its not worth it to carry that baggage.)