Re: [whatwg/encoding] Consider adding TextEncoder.containsLoneSurrogates() static (#174)

I think I'm convinced that adding this to `String` in some manner is the way to go if it's needed. Encodings require UTF strings as input and only output UTF strings. And `TextEncoder` isn't the only API that has such a requirement and acts in this "lossy" way. Every API that uses `USVString` does this, so we'd need a generic solution, which makes this an input problem, not a specific API problem.

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