fix Set().entries() inference

[lifeiscontent]

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Fixes #

If someone can point me to where I can write a test for this, happy to do so.

the updates I've made solve for this case:

type Actual = Set<'foo' | 'bar'>['entries'];
// ^? () => IterableIterator<['foo' | 'bar', 'foo' | 'bar']>
type Expected = () => IterableIterator<["foo", "foo"] | ["bar", "bar"]>;

[typescript-bot]

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