[3.0] [CloudKit overlay] Work around an NSError bridging issue specific to CKError #4960
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While here, fix up the type signature of
CKError.partialErrorsByItemID
; it doesn't make sense to useNSObject
now that we have
AnyHashable
.This is an awful PR; it narrowly works around an issue with a specific API, and omits a test case because the testing harness isn't set up to handle testing frameworks that require entitlements. I've manually verified that this workaround makes the APIs usable and am looking into the issue of
NSError
subclasses more generally.Resolves rdar://problem/27936562.
(cherry picked from commit 661df18)