[amendment] Add `inverse()` to SE-0240 for API parity with Foundation (#1052)
[amendment] Add `inverse()` to SE-0240 for API parity with Foundation (#1052)

* [amendment] Add `inverse()` to SE-0240 for API parity with -[NSOrderedCollectionDifference inverseDifference]

* Kick off amendment review

hartbit/swift-evolution,Nirma/swift-evolution,ddunbar/swift-evolution,Nirma/swift-evolution,hartbit/swift-evolution,anandabits/swift-evolution,abertelrud/swift-evolution,apple/swift-evolution,abertelrud/swift-evolution,apple/swift-evolution,natecook1000/swift-evolution,ddunbar/swift-evolution,natecook1000/swift-evolution,anandabits/swift-evolution