There's a large body of existing code out there, some of which might rely on the current behavior but never be updated. I doubt any length of deprecation perio

There's a large body of existing code out there, some of which might rely on the current behavior but never be updated. I doubt any length of deprecation period would solve this issue. Instead, adding .at() allows having the new feature now, and in a way that's possible to polyfill for backwards compatibility.