Merge pull request #7 from wickwirew/master

Sorry I've been unresponsive, if it passes our test suite then I'm happy to merge it. If any issues arise, I'm sure we'll hear about them. :)

Sources/Reflection/Set.swift

@@ -1,6 +1,7 @@
 /// Set value for key of an instance
 public func set(_ value: Any, key: String, for instance: inout Any) throws {
-    try property(type: type(of: instance), key: key).write(value, to: mutableStorage(instance: &instance))
+    let type = type(of: instance)
+    try property(type: type, key: key).write(value, to: mutableStorage(instance: &instance, type: type))
 }
 
 /// Set value for key of an instance

Sources/Reflection/Storage.swift

@@ -11,12 +11,20 @@ extension AnyExtensions {
 }
 
 func mutableStorage<T>(instance: inout T) -> UnsafeMutableRawPointer {
-    return UnsafeMutableRawPointer(mutating: storage(instance: &instance))
+    return mutableStorage(instance: &instance, type: type(of: instance))
 }
 
+func mutableStorage<T>(instance: inout T, type: Any.Type) -> UnsafeMutableRawPointer {
+    return UnsafeMutableRawPointer(mutating: storage(instance: &instance, type: type))
+}   
+
 func storage<T>(instance: inout T) -> UnsafeRawPointer {
+    return storage(instance: &instance, type: type(of: instance))
+}
+
+func storage<T>(instance: inout T, type: Any.Type) -> UnsafeRawPointer {
     return withUnsafePointer(to: &instance) { pointer in
-        if type(of: instance) is AnyClass {
+        if type is AnyClass {
             return UnsafeRawPointer(bitPattern: UnsafePointer<Int>(pointer).pointee)!
         } else {
             return UnsafeRawPointer(pointer)