Walk down a spec form and for every subform that is a multi-spec
add its sub specs.

Given a multi-spec form, call its multi method methods to retrieve
its subspecs.

Given a form like (fn* [any-symbol] ... any-symbol...) replace fn* with fn
and any occurrence of any-symbol with %.

Applys normalize-spec-fn-form to any fn* sub form.

Given a spec symbol as a string, returns a string with a pretty printed
example generated by the spec.

Given a spec symbol as a string, get the spec form and prepare it for
a response.

Given a string like "clojure.core/let" or ":user/email" returns
the associated spec in the registry, if there is one.

Retrieves a list of all specs in the registry, sorted by ns/name.
If filter-regex is not empty, keep only the specs with that prefix.

Given a form, convert all non collection childs to str.