Fix ObjC Support iteration

CHANGELOG.md

@@ -4,8 +4,8 @@ x.y.z Release notes (yyyy-MM-dd)
 * None.
 
 ### Fixed
-* <How to hit and notice issue? what was the impact?> ([#????](https://github.com/realm/realm-cocoa/issues/????), since v?.?.?)
-* None.
+* Fix `RLMCollectionIterator` where `RLMCollectionIterator` contents were not RLMObject.
+  This is for users using the optional `RLMSupport.swift` file.
 
 <!-- ### Breaking Changes - ONLY INCLUDE FOR NEW MAJOR version -->
 

Realm/Swift/RLMSupport.swift

@@ -112,8 +112,8 @@ public struct RLMCollectionIterator: IteratorProtocol {
         iteratorBase = NSFastEnumerationIterator(collection)
     }
 
-    public mutating func next() -> RLMObject? {
-        return iteratorBase.next() as! RLMObject?
+    public mutating func next() -> AnyObject? {
+        return iteratorBase.next() as AnyObject?
     }
 }
 

RealmSwift/Tests/ObjectiveCSupportTests.swift

@@ -131,4 +131,27 @@ class ObjectiveCSupportTests: TestCase {
         }
         expected.forEach { testObjCSupport($0.0, value: $0.1) }
     }
+
+#if !SWIFT_PACKAGE
+    func testArraySupport() {
+        let list = List<SwiftObject>()
+        let obj = SwiftObject()
+        list.append(obj)
+        obj.doubleCol = 42.42
+        let rlmArray = ObjectiveCSupport.convert(object: list)
+        XCTAssert(rlmArray.isKind(of: RLMArray<AnyObject>.self))
+        for object in rlmArray {
+            XCTAssertEqual(obj.doubleCol, object.value(forKey: "doubleCol") as? Double)
+        }
+
+        let primitiveList = List<Double>()
+        let double = 42.42
+        primitiveList.append(double)
+        let primitiveRLMArray = ObjectiveCSupport.convert(object: primitiveList)
+        XCTAssert(primitiveRLMArray.isKind(of: RLMArray<AnyObject>.self))
+        for object in primitiveRLMArray {
+            XCTAssertEqual(double, object as? Double)
+        }
+    }
+#endif
 }