I'm a bit confused by the if-path cond-path semantics, looks like navigates to the path if the condition is not false (and considers nil a truthy value) is that correct? An example:

(s/select (s/if-path [:a]
            :a
            s/STAY)
          {:b 2})
;; => [nil]

(s/select (s/if-path (comp boolean :a)
            :a
            s/STAY)
          {:b 2})
;; => [{:b 2}]

@jlle conditions in specter paths are based on whether the path navigates to anything or not

has nothing to do with the navigated values themselves

STOP is "false" for paths

keypath always navigates, so it's always considered "true"