#TIL In Javascript, there's actually one difference between "class A {...}" and "class A extends Object {...}":
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An "extends Object" class function has all of the Object static methods (keys, getOwnPropertyNames) on it.
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(Such classes' static methods can invoke those methods via "super" if they so wish, but the utility of this is… eh.)
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speaking of utility values of "eh", I have once used an anonymous constructor:
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> var desu = new (function () { this.desu = this })()
> desu.desu.desu.desu.desu.desu.desu.desu.desu.desu.desu.desu
{ desu: [Circular] }