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Chris Tate
8f08cbbec5
`new Set(x)`, `new Map(x)`, `new WeakSet(x)`, `new WeakMap(x)` and `Object.fromEntries(x)` now accept any checked-dynamic iterable, as in Node: a native iterator (`map.keys()`, `set.values()`), a compiled generator, an object with a Symbol.iterator method, or a Set. Before, a Set seed that was not an array or a string threw "is not iterable", and a Map, weak collection or Object.fromEntries seed that was a generator or a collection other than a Map refused with SC2020. The runtime drains native iterators, packs arrays, strings and collections, and steps every other iterable through its iterator (scr_dyn_seed_values). A program that builds these from an untyped seed registers the compiled generators' next and return methods with the runtime, as destructuring rest already did, so a generator seed can be stepped. The seed's values are all taken before the first one is added, so when an entry of a Map seed is not an object the TypeError comes after the iterable is exhausted; Node closes the iterator at that entry. The limitations page says so.