diff --git a/lib/Bootstrap.js b/lib/Bootstrap.js
index 0711fba4..e389a10a 100644
--- a/lib/Bootstrap.js
+++ b/lib/Bootstrap.js
@@ -16,7 +16,6 @@
  * where deemeded necessary.
  * See http://www.bootstrap-js.net/wiki/MootoolsDifferences
  */
-
 new function() { 
 	var fix = !this.__proto__ && [Function, Number, Boolean, String, Array, Date, RegExp];
 	if (fix)
@@ -53,13 +52,11 @@ new function() {
 	}
 
 	function inject(dest, src, enumerable, base, preserve, generics) {
-		var beans;
+		var beans, bean;
 
 		function field(name, val, dontCheck, generics) {
-			if (!val)
-				val = (val = describe(src, name)) && (val.get ? val : val.value);
-			var type = typeof val, func = type == 'function', res = val,
-				prev = dest[name], bean, part;
+			var val = val || (val = describe(src, name)) && (val.get ? val : val.value),
+				func = typeof val == 'function', res = val, prev = val && val.get ? null : dest[name];
 			if (generics && func && (!preserve || !generics[name])) generics[name] = function(bind) {
 				return bind && dest[name].apply(bind,
 					Array.prototype.slice.call(arguments, 1));