This is one thing that came to my mind a couple months ago, but there are a
> number of ways to resolve this problem, such as:
>
> function mixin(a, b) {
> for (let name of Object.getOwnPropertyNames(b)) {
> let desc = Object.getOwnPropertyDescriptor(b, name);
> if (typeof desc.value == 'function')
> desc.value = desc.value.bind(b);
> Object.defineProperty(a, name, desc);
> }
> }
>
>
In order to satisfy security guarantees, properties which are keys on
private symbols are not returned by getOwnPropertyNames.
{ Kevin }
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