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).

Array, RegExp, Function, and Class Literals all already create an Object
sub-class, so why not Object Literals?

Because Object-objects are just Objects and not anything special that would need a subclass with specific methods.

Are there any other major reasons why this is a bad idea?

As you already said, it would break a great lot of code.

- Bergi
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