Use objects for hash value tracking

The use of arrays was incorrect for the data type and causing problems when hash keys conflicted with array behaviors.

Fixes #1194

(cherry picked from commit 768ddbd661)

spec/regressions.js

@@ -323,4 +323,15 @@ describe('Regressions', function() {
         }, 'useData': true});
     }
   });
+
+  it('should allow hash with protected array names', function() {
+    var obj = {array: [1], name: 'John'};
+    var helpers = {
+      helpa: function(options) {
+        return options.hash.length;
+      }
+    };
+
+    shouldCompileTo('{{helpa length="foo"}}', [obj, helpers], 'foo');
+  });
 });