[core] Minor fix

es5/infinity.js

@@ -66,10 +66,10 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 					return key in obj || areNumbers(index) && index % 1 === 0 && index >= 0;
 				},
 				enumerate: function enumerate(obj) {
-					return obj.keys();
+					return Object.keys(obj);
 				},
 				ownKeys: function ownKeys(obj) {
-					return obj.keys();
+					return Object.keys(obj);
 				}
 			};
 

package.json

@@ -5,8 +5,8 @@
 	"main": "es5/infinity.min.js",
 	"scripts": {
 		"build": "./build.sh",
-		"test:es6": "NODE_ENV=development jasmine",
-		"test:es5": "NODE_ENV=production npm run build && jasmine",
+		"test:es6": "NODE_ENV=development npx jasmine",
+		"test:es5": "NODE_ENV=production npm run build && npx jasmine",
 		"test": "npm run test:es6 && npm run test:es5",
 		"prepublishOnly": "npm test"
 	},

src/InfiniteList.js

@@ -29,8 +29,8 @@ const handler = {
 				(index >= 0))
 		)
 	},
-	enumerate: obj => obj.keys(),
-	ownKeys: obj => obj.keys(),
+	enumerate: obj => Object.keys(obj),
+	ownKeys: obj => Object.keys(obj),
 };
 
 class InfiniteList {