Merge pull request #7 from AndrewBrownK/fix-in-node

Fix _unsafeReadProtoTagged in node.js

Author: garyb

src/Web/Internal/FFI.js

@@ -1,9 +1,23 @@
 "use strict";
 
 exports._unsafeReadProtoTagged = function (nothing, just, name, value) {
-  var ty = window[name];
-  if (ty != null && value instanceof ty) {
-    return just(value);
+  if (typeof window !== "undefined") {
+    var ty = window[name];
+    if (ty != null && value instanceof ty) {
+      return just(value);
+    }
+    return nothing;
+  } 
+  var obj = value;
+  while (obj != null) {
+    var proto = Object.getPrototypeOf(obj);
+    var constructorName = proto.constructor.name;
+    if (constructorName === name) {
+      return just(value);
+    } else if (constructorName === "Object") {
+      return nothing;
+    }
+    obj = proto;
   }
   return nothing;
 };