`Reflect` is problematic on older versions of node.js

lib/worker.js

@@ -59,7 +59,7 @@ process.once("message", function (obj) {
 		}
 	};
 
-	Reflect.ownKeys(global.self).forEach(function (key) {
+	Object.keys(global.self).forEach(function (key) {
 		global[key] = global.self[key];
 	});
 

src/worker.js

@@ -51,7 +51,7 @@ process.once("message", obj => {
 		}
 	};
 
-	Reflect.ownKeys(global.self).forEach(key => {
+	Object.keys(global.self).forEach(key => {
 		global[key] = global.self[key];
 	});