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When for...of iterates a string containing a character represented by one UTF-16 surrogate pair, how is that pair handled?

The pair is consumed together as one code pointՃիշտ պատասխան
Each code unit always becomes a separate iteration
The loop throws because the string contains two code units
The pair is skipped because only ASCII characters are iterable

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String iteration advances by Unicode code point, so the two code units of a valid surrogate pair are delivered together for that code point. Treating every code unit as a separate iteration confuses for...of with direct UTF-16 indexing; a code point still need not equal a full grapheme.

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