Checker rejects a numeric enum member used as an enum initializer #3605

enum Base { A = 4 }
enum E { A = Base.A, B }
console.log(E.B);

TypeScript 6.0.3 accepts this and its emitted JavaScript prints 5. SharpTS with --no-tsconfig --strict --noEmit reports TS18033 for A. The checker also rejects enum E { Initial = 4, A = E.Initial, B }. Both references should be accepted as numeric constants. This concerns checking the member reference as the entire initializer. #3595 concerns interpreting an arithmetic expression that already passes checking.