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@jcomplex: hey! I'd say schema is telling you that it found the keyword :id
where it expected to find something sequential. For instance I got this in ly repl:
(require '[schema.core :as s])
=> nil
(s/check [s/Keyword] [:id])
=> nil
(s/check [s/Keyword] :id)
=> (not (sequential? :id))
(s/check [s/Str] :id)
=> (not (sequential? :id))