replace hasOwnProperty with !== undefined

lib/compile/rules/properties.dot.js

@@ -95,7 +95,7 @@ var {{=$valid}} = true;
       }}
 
       {{? $breakOnError }} {{=$valid}} = true; {{?}}
-      if ({{=$data}}.hasOwnProperty('{{= $propertyKey }}')) {
+      if ({{=$data}}['{{= $propertyKey }}'] !== undefined) {
         {{ /* TODO cache data types and paths by keys for patternProperties */ }}
         {{ var $useKey = '"' + $propertyKey + '"'; }}
         {{# def.validateProperty:$useKey }}

lib/compile/rules/required.dot.js

@@ -4,13 +4,13 @@
 {{? $schema.length <= 100 }}
   {{=$valid}} = {{~ $schema:$property:$i }}
                      {{? $i}} && {{?}}
-                     {{=$data}}.hasOwnProperty('{{= it.escapeQuotes($property) }}')
+                     {{=$data}}['{{= it.escapeQuotes($property) }}'] !== undefined
                    {{~}};
 {{??}}
   var schema{{=$lvl}} = validate.schema{{=$schemaPath}};
 
   for (var i{{=$lvl}} = 0; i{{=$lvl}} < schema{{=$lvl}}.length; i{{=$lvl}}++) {
-    {{=$valid}} = data.hasOwnProperty(schema{{=$lvl}}[i{{=$lvl}}]);
+    {{=$valid}} = data[schema{{=$lvl}}[i{{=$lvl}}]] !== undefined;
     if (!{{=$valid}}) break;
   }
 {{?}}

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ajv",
-  "version": "0.2.2",
+  "version": "0.2.3",
   "description": "Another JSON schema Validator",
   "main": "lib/ajv.js",
   "scripts": {