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I thought spec wasn't that great? Or was this some time ago and it has improved meanwhile?

I also saw TypedClojure but not sure what to choose.

Before going typedclojure. There is also malli, there is also schema.

People have this urge for types, but I would give it a shot and apply types/validation when you really need or miss important edgecase etc.

Spec is good if you need something robust and highly composable. Its always a tradeoff, but it has the best flexibility.