WIP

WoofWare.PawPrint.Test/sourcesPure/IsinstFailed.cs

@@ -14,8 +14,11 @@ public class Program
     {
         Bird sparrow = new Bird { CanFly = true };
 
-        // This should fail and return null (not throw)
-        Fish fish = sparrow as Fish;
+        // Cast to object first to bypass compile-time checking
+        object obj = sparrow;
+
+        // This should fail at runtime and return null (not throw)
+        Fish fish = obj as Fish;
 
         return fish == null ? 42 : 0;
     }

WoofWare.PawPrint.Test/sourcesPure/IsinstFailedInterface.cs

@@ -0,0 +1,30 @@
+public class Program
+{
+    public interface IAnimal
+    {
+        string Name { get; set; }
+    }
+
+    public class Bird : IAnimal
+    {
+        public string Name { get; set; }
+        public bool CanFly { get; set; }
+    }
+
+    public class Fish : IAnimal
+    {
+        public string Name { get; set; }
+        public bool CanSwim { get; set; }
+    }
+
+    public static int Main(string[] args)
+    {
+        IAnimal animal = new Bird { Name = "Sparrow", CanFly = true };
+
+        // This should fail at runtime and return null (not throw)
+        // because the actual object is Bird, not Fish
+        Fish fish = animal as Fish;
+
+        return fish == null ? 42 : 0;
+    }
+}