> set(key, value) {
>
> let data = this[$data];
>
> if (!data)
> throw new TypeError('this object must be a StringMap');
>
> if (!(key in data))
> this[$size]++;
>
> data[key] = value;
>
> }
Doh! I wrote that in such a way that an inconsistency cannot be introduced,
since `$data` is retrieved before `$size` is changed, and then the mutation on
the data object happens without the use of a private symbol.
However, I think you get the idea.
Probably a better example would have been one where I wanted to mutate two
private symbol properties with primitive values, in which case they would both
require calls to `unknownPrivateSymbol` when being set.
Nathan
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