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Do we definitely want to do this? We're adding work to a hot code path and creating a bit of an ambiguous situation in the case where the derivation refers to itself on the first run, both in runtime terms (the value is null initially which is weird enough — it should be undefined — and likely to cause problems when accessing properties of the derived value later on) and in terms of types:

It's solvable with effects, without penalising the vast majority of people who don't need this. I'd be in favour of a dev time check that printed a more helpful error — something like this instead of 'too much recursion':

A derived value cannot refer to itself

I'll add a compiler warning tomorrow :)