Thats a good point. It is probably rare for proposals to change after stage 3 which is why the TypeScript team does not implement a ECMAScript feature until it

Thats a good point. It is probably rare for proposals to change after stage 3 which is why the TypeScript team does not implement a ECMAScript feature until it reaches Stage 3. In this case, members of the TS team were actually championing these ES proposals :)