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also async iterables
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michaelficarra committed Jul 23, 2024
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Expand Up @@ -40,7 +40,7 @@ NB: This convention is new as of 2024, and most earlier parts of the language do

## Reject primitives in iterable-taking positions

Any time an iterable value (a value that has a `Symbol.iterator` method) is expected, primitives should be treated as if they were not iterable. Usually, this will mean throwing a `TypeError`. Primitive wrapper Objects such as String Objects, however, should be treated like any other Object.
Any time an iterable or async-iterable value (a value that has a `Symbol.iterator` or `Symbol.asyncIterator` method) is expected, primitives should be treated as if they were not iterable. Usually, this will mean throwing a `TypeError`. Primitive wrapper Objects such as String Objects, however, should be treated like any other Object.

Although primitive Strings are default iterable (`String.prototype` has a `Symbol.iterator` method which enumerates code points), it is now considered a mistake to iterate a String without specifying whether the String is providing an abstraction over code units, code points, grapheme clusters, or something else.

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