Encoding independent method?

[hax]

This may be out of the scope of this proposal.

Currently all methods at, charAt, codePointAt, charCodeAt methods and length property are utf-16 based. This limits the engine to always use UTF-16 encoding internally. But most text in Web is UTF-8 which means engines need many encoding conversions.

Maybe we can add some encoding-independant methods which can avoid such burden.

For example:

const [ch, units] = '😈'.at(0)

units can return 2 if underground encoding is UTF-16, or return 4 if underground encoding is UTF-8.