Those are 2 of the most significant (and eagerly awaited) new(er) features though (although I thought BigInt was more like 5-6 years old) edit: Edge and Safari

Those are 2 of the most significant (and eagerly awaited) new(er) features though (although I thought BigInt was more like 5-6 years old) edit: Edge and Safari only added support in 2020, so it has only been useable without polyfills for a few years