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> Have I learned anything directly useful?

You probably haven't. But a less experienced programmer has learned why you should always use ===.

The example at the end of the article shows how you can have the same problem while always using ===.

The example at the end of the article shows how you deserve all sorts of bad things happening to you if you mutate values in a freaking getter.

I think it's a great example of why overriding the default prototype functions is a bad idea.