Replace THEN and IS keywords with DO.
Increase heap size (for testing).
Reorganize grammar file.
Remove coalescing (for now).
Remove verifier (for now).
Add naive record type.
Add draft of multimethod dispatch.
Fix GC recursion issue.
Fix leak with new dispatch AST node.
Fix empty-collection allocation.
Define index get/set and print as multimethods.
Remove native not-equals.
Convert arithmetic and logic to multimethods.
Change type of null to nil to avoid parse error.
Convert relation operators to multimethods.
Remove newline.
Add missing annotations to builtins.