a.k.a. — the `precise` property of `UIDropProposal` (see: https://developer.apple.com/documentation/uikit/uidropproposal?language=objc) was not adopted in time for iOS 11.
<rdar://problem/46570101>
Created attachment 356862 [details] Patch
Comment on attachment 356862 [details] Patch Clearing flags on attachment: 356862 Committed r239039: <https://trac.webkit.org/changeset/239039>
All reviewed patches have been landed. Closing bug.