Like clojure.walk/macroexpand-all, but preserves and macroexpands
metadata. Also store the original form (unexpanded and stripped of
metadata) in the metadata of the expanded form under original-key.

Non-throwing version of (vary-meta obj merge metamap-1 metamap-2 ...).
Like `vary-meta`, this only applies to immutable objects. For
instance, this function does nothing on atoms, because the metadata
of an `atom` is part of the atom itself and can only be changed
destructively.

Return special form or var's meta.

Special forms that can be apropo'ed.

Return info for the symbol if it's a special-symbol?, or nil otherwise.

Strip meta from form.
If keys are provided, strip only those keys.

Find the source of the var `v`.
Return a map of the var's metadata (:file, :line, :column, etc.) as well as:
  - :form : The form, as read by `clojure.core/read`, and
  - :code : The source code of the form
Return nil if the source of the var cannot be found.

Return special form or var's docstring, optionally limiting the number of
sentences returned to n.

Return a map of metadata for var v.
If whitelist is missing use var-meta-whitelist.

Return special form or var's namespace-qualified name as string.