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"Polymorphism" is being used incorrectly here. Please see here [0] for a good explanation.

[0]: https://docs.oracle.com/javase/tutorial/java/IandI/polymorph...

The link is completely different than it was when I commented. That doesn't mean the criticism of my comment are invalid, but this is pretty weird.

as with a lot of js terminology, it's been re-appropirated:

http://mrale.ph/blog/2015/01/11/whats-up-with-monomorphism.h...

also, polyfill (hip) === shim (no longer hip)

The term is not merely a recent appropriation. Parametric polymorphism is a concept from functional programming and formal type theory, with application far beyond just JavaScript.

tbh, polymorphism makes more sense to me in the parametric definition [in the context of weak types/signatures] than in the standard oop def.

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