Make lazyRegister have 'even lazier' behavior such that behaviors are…

… not mixed in until first-instance time.

src/lib/base.html

@@ -30,10 +30,6 @@
 
     // `this` context is a prototype, not an instance
     registerCallback: function() {
-      if (!settings.lazierRegister) {
-        this._desugarBehaviors(); // abstract
-        this._doBehavior('beforeRegister'); // abstract
-      }
       this._registerFeatures();  // abstract
       if (!settings.lazyRegister) {
         this.ensureRegisterFinished();
@@ -62,14 +58,12 @@
     },
 
     _ensureRegisterFinished: function(proto) {
-      if (proto.__hasRegisterFinished !== proto.is) {
-        // TODO(sorvell): moving all behavior work here means that
-        // custom constructor and is cannot be done in a behavior.
-        // This probably means we need another flag for this
-        if (settings.lazierRegister) {
-          proto._desugarBehaviors(); // abstract
-          proto._doBehavior('beforeRegister'); // abstract
-        }
+      if (proto.__hasRegisterFinished !== proto.is || !proto.is) {
+        // NOTE: since all behavior is here, this means
+        // custom constructor and `is` cannot be done in a behavior
+        // when lazyRegister is true.
+        proto._desugarBehaviors(); // abstract
+        proto._doBehavior('beforeRegister'); // abstract
         proto.__hasRegisterFinished = proto.is;
         if (proto._finishRegisterFeatures) {
           proto._finishRegisterFeatures();