How to track a string-variable in JavaScript

Requirement : To be able to track a string variables in javascript by assigning a unique ID to each variable.

Example:

var a = 'alkd';
var b = 'iquwq';  
console.log(a.id); # 1234
console.log(b.id); # 5678

What I have tried : I have tried extending string object by adding a new method or property to 'String.prototype'

Output :

console.log(a.id); #1234
console.log(b.id); #1234 (returning same id as above)

What i have observed : Ever instance of a string is inherited from String.prototype. Changes to String.Prototype object are propagated to all String instances.

Example :

a.id = 8783; # setter
console.log(b.id)# returns 8783

My Questions :

1. Is it actually possible to get required functionality by extending String Object ?


2. Is there any alternative way to do this ?


3. Are there any plans to add such functionality to future editions of ECMAScript ?