prevent some common JIT issues

* keep shapes stable when possible
* prime with common scenarios

lib/loader/loader.js

@@ -52,7 +52,7 @@ var loader, define, requireModule, require, requirejs;
 
   var defaultDeps = ['require', 'exports', 'module'];
 
-  function Module(name, deps, callback) {
+  function Module(name, deps, callback, alias) {
     this.id        = uuid++;
     this.name      = name;
     this.deps      = !deps.length && callback.length ? defaultDeps : deps;
@@ -62,6 +62,7 @@ var loader, define, requireModule, require, requirejs;
     this._require  = undefined;
     this.finalized = false;
     this.hasExportsAsDep = false;
+    this.isAlias = alias;
   }
 
   Module.prototype.makeDefaultExport = function() {
@@ -144,7 +145,11 @@ var loader, define, requireModule, require, requirejs;
       deps     =  [];
     }
 
-    registry[name] = new Module(name, deps, callback);
+    if (callback instanceof Alias) {
+      registry[name] = new Module(callback.name, deps, callback, true);
+    } else {
+      registry[name] = new Module(name, deps, callback, false);
+    }
   };
 
   // we don't support all of AMD
@@ -171,9 +176,8 @@ var loader, define, requireModule, require, requirejs;
   function findModule(name, referrer) {
     var mod = registry[name] || registry[name + '/index'];
 
-    while (mod && mod.callback instanceof Alias) {
-      name = mod.callback.name;
-      mod = registry[name];
+    while (mod && mod.isAlias) {
+      mod = registry[mod.name];
     }
 
     if (!mod) { missingModule(name, referrer); }
@@ -214,4 +218,21 @@ var loader, define, requireModule, require, requirejs;
     requirejs.entries = requirejs._eak_seen = registry = {};
     seen = {};
   };
+
+  // prime
+  define('foo',      function() {});
+  define('foo/bar',  [], function() {});
+  define('foo/asdf', ['module', 'exports', 'require'], function(module, exports, require) {
+    require('foo/bar');
+  });
+  define('foo/baz',  [], define.alias('foo'));
+  define('foo/quz',  define.alias('foo'));
+  define('foo/bar',  ['foo', './quz', './baz', './asdf', './bar', '../foo'], function() {});
+  define('foo/main', ['foo/bar'], function() {});
+
+  require('foo/main');
+  require.unsee('foo/bar');
+
+  requirejs.clear();
+
 })(this);