is there a way to spec a map according to its key? example: if key is a number, value should be a number, if key is something else then value should be a string

Yes, although it’s a little complicated

The structure is to spec it as a s/coll-of s/tuples, where each tuple is an s/or of whatever key/value is allowed

The coll-of should also have an :into {}

something like

(s/coll-of (s/or :num-val (s/tuple number? number?)
                 :string-val (s/tuple (s/and any? (complement number?)) string?))
           :into {})

yep

got it, tks!

I ran across something unexpected when using spec alpha v1:

(s/def ::foo number?)
(s/def ::bar-ret ::foo)
(gen/generate (s/gen ::bar-ret {::bar-ret #(gen/return 100)}))
;; => -2123123

(let [s (@#'s/specize ::bar-ret)]
  (@#'s/spec-name s))
;; => ::foo

this is a known bug (there's a ticket for it) and we plan to fix in spec 2

your workaround is fine

Awesome, thanks!