fix bisecting in helper.idex

Author: cherifGsoul

src/helpers.js

@@ -71,10 +71,11 @@ var helpers = {
 			var mid = (low + high) >>> 1,
 				item = items[mid],
 				computed = compare(props, item);
-			
+
 			if (computed === 0) {
 				range.push(item);
-				low++;
+				low = mid + 1;
+				high--;
 			} else if (computed === -1) {
 				high = mid;
 			} else {

src/types/basic-query-sorting-test.js

@@ -398,7 +398,7 @@ QUnit.test("index should not sort unchanged items #33", function(assert) {
 
 
 	var query = new BasicQuery({
-        sort: "name"
+		sort: "name"
 	});
 
 	var res = query.index({id:4, name: "Item 1"}, items);