>
>
>> This is trivial with Symbols:
>
> let shuffle = Symbol();
>
> Array.prototype[shuffle] = function() {...};
>
>
> Only code that has access to the `shuffle` symbol may use the method:
>
> let shuffled = array[shuffle]();
>
>
Unfortunately, such a construction will fail in a multi-realm (i.e.
multiple frames) environment.
{ Kevin }
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