New operator and extended dot operator subdocument search

lib/model.js

@@ -669,7 +669,6 @@ function matchQueryPart (obj, queryKey, queryValue) {
   // Check if the object value is an array
   if (util.isArray(objValue)) {
     // Check if it's a query operator array
-    // TODO REFACTOR!!! keys[0]!!!
     if (queryValue !== null && typeof queryValue === 'object' && !util.isRegExp(queryValue)) {
       keys = Object.keys(queryValue);
       firstChars = _.map(keys, function (item) { return item[0]; });