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

> 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.

We already don't support streaming [well], because currently this will result in two replacement characters. It seems better to throw explicitly on such cases, and, as you said, defer handling of streaming to the upper layer.

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