feature: support toLiquid, working on #81

src/scope.js

@@ -63,7 +63,10 @@ var Scope = {
     } else {
       if (typeof obj.to_liquid === 'function') {
         obj = obj.to_liquid()
+      } else if (typeof obj.toLiquid === 'function') {
+        obj = obj.toLiquid()
       }
+
       if (key === 'size' && (_.isArray(obj) || _.isString(obj))) {
         val = obj.length
       } else {

src/util/underscore.js

@@ -11,8 +11,12 @@ function isString (value) {
 }
 
 function stringify (value) {
-  if (value && typeof value.to_liquid === 'function') {
-    return stringify(value.to_liquid())
+  if (!isNil(value)) {
+    if (typeof value.to_liquid === 'function') {
+      return stringify(value.to_liquid())
+    } else if (typeof value.toLiquid === 'function') {
+      return stringify(value.toLiquid())
+    }
   }
   if (isString(value)) {
     return value