allow 0 as path element (closes #2)

index.js

@@ -30,31 +30,31 @@ exports.stringify = function(obj) {
   obj = obj || {};
 
   var parts = [];
-  if (obj.type) {
+  if (typeof obj.type !== 'undefined') {
     parts.push(obj.type);
   } else {
     if (obj.id || obj.subtype || obj.version || obj.index) parts.push('');
   }
 
-  if (obj.id) {
+  if (typeof obj.id !== 'undefined') {
     parts.push(obj.id);
   } else {
     if (obj.subtype || obj.version || obj.index) parts.push('');
   }
 
-  if (obj.subtype) {
+  if (typeof obj.subtype !== 'undefined') {
     parts.push(obj.subtype);
   } else {
     if (obj.version || obj.index) parts.push('');
   }
   
-  if (obj.version) {
+  if (typeof obj.version !== 'undefined') {
     parts.push(obj.version);
   } else {
     if (obj.index) parts.push('');
   }
 
-  if (obj.index) parts.push(obj.index);
+  if (typeof obj.index !== 'undefined') parts.push(obj.index);
 
   return parts.join('/');
 };

test/stringify_test.js

@@ -127,3 +127,14 @@ test('type/id/subtype/version/index', function(t) {
   }), 'mytype/myid/mysubtype/myversion/myindex', 'should return string with type, id, subtype, version and index');
   t.end();
 });
+
+test('0/1/2/3/4', function(t) {
+  t.deepEqual(stringify({
+    type: 0,
+    id: 1,
+    subtype: 2,
+    version: 3,
+    index: 4 
+  }), '0/1/2/3/4', 'should correctly handle number path fields');
+  t.end();
+});