Karoy Lorentey 9e4dcd8bae [Foundation] Coalesce duplicate keys in String-keyed NSDictionary and NSSet instances ...

NSString has a stricter concept of equality than Swift’s String, so it is possible to construct NSDictionary/NSSet instances that contain duplicate keys according to Swift’s definition of string equality. This change improves how we handle these cases by coalescing the duplicate keys (keeping a single value).

rdar://problem/35995647

2018-01-19 22:35:59 +00:00

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