Proposal About Private Symbol

[Kevin Smith]

>
> ```js
> var constructor=function(){
>     'use strict';
>     var allObjects=new WeakSet();
>     var privateSymbol=Symbol('private', true);
>     var ret=function(){
>         if(this===undefined)throw Error('Invalid Construction');
>         this[privateSymbol]=1;
>         allObjects.add(this);
>     }
>     ret.prototype.set=function(sth){
>         if(!allObject.has(this))throw Error('Invalid Call');
>         this[privateSymbol]=sth; // Now this can be called safely, no more
> worry about leak to Proxy
>     }
>     ret.bind(undefined);
> }
> ```
>

One of the goals of any "object-private state" proposal has to be:

- It should be easy to create private-state-carrying abstractions which are
"safe",
- It should be easy to validate such abstractions as "safe".

I think the code above is a great illustration of how private symbols fail
to satisfy these goals.
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