What are the rules for `reactive`? Can I use es2015 classes in my "state" about arrow-js HOT 4 OPEN

It does not technically need to be serializable, but it does need to be easy to proxy and generally not use any methods for access. Maps/Sets, for example do not work because they would require that we extend the proxy surface area to all their methods. If you had a custom class that used simple property access myInstance.foo = 123 and myInstance.foo then it should work fine. POJOs are the "safest" bet at the moment.

Of course arrow is experimental, so we could decide to make this more comprehensive, but I’d like to really stick to a tight byte budget here.

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It might be worth a few bytes to special case Map, In my experience it that's a pretty foundational type.
I respect your byte budget goal, though. It is possible to use objects, but the ergonomics of Map really are a lot better.

Maybe it would be possible to provide a way for users to extend the proxying mechanism, so that it would
be possible for users to add support for types without needing to include that in the main library?
I think keeping the core simple is a worthy goal in and of itself though.

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+1 to the idea of letting users extend reactivity support. It seems friendly enough to let someone provide a third party "make more types work with reactivity" library.

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I love the idea of providing a reactivity plugin mechanism. I will definitely work that into the next refactor.

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