fix: 'set on proxy' error

* 1. if object extends another object from contextified code, uncorrect proxy setter make it not settable
* 2. this fix just change the proxy setter in contextify
* 3. detail patriksimek#101 (comment)

lib/contextify.js

@@ -1,4 +1,5 @@
-'use strict'
+'
+jse strict'
 
 const global = this;
 const console = host.console;
@@ -17,7 +18,23 @@ const DEBUG = false;
 const OPNA = 'Operation not allowed on contextified object.';
 const ERROR_CST = Error.captureStackTrace;
 const FROZEN_TRAPS = {
-	set: (target, key) => false,
+ 	set: (target, key, value, receiver) => {
+ 		if( target !== receiver ){
+
+ 			Object.defineProperty(receiver, key, {
+ 				value: value,
+ 				writable: true,
+ 				enumerable: true,
+ 				configurable: true
+ 			})
+
+ 			return true;
+
+ 		}
+
+ 		return false;
+
+ 	},
 	setPrototypeOf: (target, key) => false,
 	defineProperty: (target, key) => false,
 	deleteProperty: (target, key) => false,