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Extensions/CaseIterable+Next.swift

@@ -1,8 +1,15 @@
 extension CaseIterable where Self: Equatable {
-    func next() -> Self {
+    func next(nilAtEnd: Bool = false) -> Self! {
         let all = Self.allCases
         let index = all.firstIndex(of: self)!
         let next = all.index(after: index)
+
+        if nilAtEnd == true {
+            if next == all.endIndex {
+                return nil
+            }
+        }
+
         return all[next == all.endIndex ? all.startIndex : next]
     }
 }

Extensions/TypedContentAccessors.swift

@@ -0,0 +1,6 @@
+import Siesta
+import SwiftyJSON
+
+extension TypedContentAccessors {
+    var json: JSON { typedContent(ifNone: JSON.null) }
+}