Changes "is" and equality checks to strictly check for primitive types, fix a couple of

compiler/lib/implementation/rtt.js

Index: compiler/lib/implementation/rtt.js
===================================================================
--- compiler/lib/implementation/rtt.js	(revision 400)
+++ compiler/lib/implementation/rtt.js	(working copy)
@@ -269,7 +269,7 @@
  * @return {boolean}
  */
 function $isBool(o) {
-  return typeof o == 'boolean' || o instanceof Boolean;
+  return typeof o == 'boolean';
 }
 
 /**
@@ -277,7 +277,7 @@
  * @return {boolean}
  */
 function $isNum(o) {
-  return typeof o == 'number' || o instanceof Number;
+  return typeof o == 'number';
 }
 
 /**
@@ -285,5 +285,5 @@
  * @return {boolean}
  */
 function $isString(o) {
-  return typeof o == 'string' || o instanceof String;
+  return typeof o == 'string';
 }