feature: make a best guess at prettifying object that have no prototype

specs/validate-helpers-spec.js

@@ -202,6 +202,25 @@ describe("validate", function() {
       expect(validate.prettify(object)).toEqual("Custom string");
     });
 
+    it("tries to stringify objects that don't implement toString", function() {
+      var object = Object.create(null);
+
+      object.name = "Foo Bar";
+
+      expect(validate.prettify(object)).toEqual("{\"name\":\"Foo Bar\"}");
+    });
+
+    it("throws an error when trying to parse cyclical structures", function() {
+      var object = Object.create(null);
+
+      object.name = "Foo Bar";
+      object.cycle = object;
+
+      expect(function () { 
+        return validate.prettify(object); 
+      }).toThrow();
+    });
+
     it("doesn't allow too many decimals", function() {
       expect(validate.prettify(4711)).toEqual("4711");
       expect(validate.prettify(4711.2)).toEqual("4711.2");

validate.js

@@ -387,6 +387,10 @@
       }
 
       if (v.isObject(str)) {
+        if (!v.isDefined(str.toString)) {
+          return JSON.stringify(str);
+        }
+
         return str.toString();
       }