I wrote:
Brian Ninni wrote:

On more than one occasion I've had to determine whether something was a
plain old Object, or some other class. This involves checking that the
given object was NOT an instanceof any other acceptable class.

`Object.prototype.isPrototypeOf(o)` should do that (if you don't care
about other realms).

Ooops, `Object.getPrototypeOf(o) === Object.prototype` is what I meant.

- Bergi

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