Plists

The Plist type represents an unordered plist, with a different type for each possible key. Similarly to Cons, the Plist type is read-write, and &Plist is the read-only version.

(et-subtype? (et (Plist :num Integer)) (et (Plist :num Number)))
;; -> nil
(et-subtype? (et (&Plist :num Integer)) (et (&Plist :num Number)))
;; -> t

If nil is a valid value for a particular key's type, then that key is optional.

(et-is? '(:a 4) (&Plist :a Integer :b Integer))
;; -> nil
(et-is? '(:a 4) (&Plist :a Integer :b Integer?))
;; -> t
(et-is? nil (&Plist :a Integer? :b Integer?))
;; -> t