Bump to v4.6.0.

_cloneBuffer.js

@@ -12,9 +12,7 @@ define([], function() {
     if (isDeep) {
       return buffer.slice();
     }
-    var Ctor = buffer.constructor,
-        result = new Ctor(buffer.length);
-
+    var result = new buffer.constructor(buffer.length);
     buffer.copy(result);
     return result;
   }