Karoy Lorentey 01d7b5799c [stdlib] Fix handling of duplicate items in generic Set.intersection ...

If the sequence passed to `Set.intersection` has exactly as many duplicate items as items missing from `self`, then the new implementation in 5.6 will mistakenly return `self` unchanged. (It counts duplicate hits as distinct items in the result.)

rdar://94803458

2022-06-13 14:12:48 -07:00

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