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

It's a little different though. The contract of an encoding is to provide a mapping between a byte sequence and a scalar value sequence. In particular this excludes a code point sequence.

From that perspective it makes more sense to defer that concern to a higher layer. If we don't want to do that anymore, we'd also have to support streaming I think, in case your input ends with a lone surrogate, but a subsequent call might provide the other lone surrogate that together form a scalar value.

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