feat: iterator chain / concatenation (lazy concat of iterables) - #1917
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Closes toss#771. Add chain(...iterables): a lazy generator that yields every element of every iterable, in order, without an intermediate array. Works with any iterable: arrays, strings, Sets, generators. Returns an IterableIterator, so callers can `Array.from(chain(...))`, spread it, or use `.next()`.
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Closes #771.
Add chain(...iterables): a lazy generator that yields every element of every iterable, in order, without an intermediate array. Works with any iterable: arrays, strings, Sets, generators. Returns an IterableIterator, so callers can
Array.from(chain(...)), spread it, or use.next().