File four issue write-ups discovered alongside the 0179 work:
- 0185: binary-op operand auto-unwrap silently miscompiles a NULL ?T
- 0186: closure VALUE call does not coerce arg to ?T parameter
- 0187: lambda with inferred return type + block body with early returns
mis-infers its return type
- 0188: closure-VALUE calls skip argument validation (arity + tuple spread)
