`:clojure.spec.alpha/spec` is a function, whereas `:pred` is a symbol

repl.txt

If a predicate is passed to `explain-data` directly (to be used as a spec), then the `spec` value is not a symbol, but the function itself.

This makes it tricky to write a consistent printer - I'd like to be able to say "<value> did not match <predicate>" in a consistent way.

user=> *clojure-version*
{:major 1, :minor 9, :incremental 0, :qualifier "alpha19"}
user=> (require '[clojure.spec.alpha :as s])
nil
user=> (::s/spec (s/explain-data string? 1))
#object[clojure.core$string_QMARK___4964 0x125290e5 "clojure.core$string_QMARK___4964@125290e5"]
user=> (type (::s/spec (s/explain-data string? 1)))
clojure.core$string_QMARK___4964
user=> (s/def :example/str string?)
:example/str
user=> (:pred (first (::s/problems (s/explain-data :example/str 1))))
clojure.core/string?
user=> (type (:pred (first (::s/problems (s/explain-data :example/str 1)))))
clojure.lang.Symbol