fix default filter

filters.js

@@ -25,7 +25,7 @@ var filters = {
         if (v === 'now') v = new Date();
         return strftime(v, arg);
     },
-    'default': (v, arg) => arg || v,
+    'default': (v, arg) => v || arg,
     'divided_by': (v, arg) => Math.floor(v / arg),
     'downcase': v => v.toLowerCase(),
     'escape': escape,

test/filters.js

@@ -53,7 +53,10 @@ describe('filters', function() {
         });
     });
 
-    it('should support default', () => test('{{false |default: "a"}}', 'a'));
+    describe('default', function() {
+        it('should use default when falsy', () => test('{{false |default: "a"}}', 'a'));
+        it('should not use default when truthy', () => test('{{true |default: "a"}}', 'true'));
+    });
 
     describe('divided_by', function() {
         it('should return 2 for 4,2', () => test('{{4 | divided_by: 2}}', '2'));