Custom auto-resolve is not applied for :track-position? zippers

[lread]

Version
1.0.644-alpha

Platform
all

Symptom
When specifying a custom :auto-resolve fn on a zipper that also specifies :track-position? true, the custom auto-resolve function is not applied.

Reproduction

(require '[rewrite-clj.zip :as z])

(-> "::kw"
    (z/of-string {:track-position? true
                  :auto-resolve (constantly 'testing123) })
    z/sexpr)

Actual behavior
The default auto-resolve behaviour is applied.

;; => :?_current-ns_?/kw

Expected behavior
The custom auto-resolve fn should be applied and return:

;; => :testing123/kw

... as it does when :track-position? is not included in zipper options:

(-> "::kw"
    (z/of-string {:auto-resolve (constantly 'testing123) })
    z/sexpr)
;; => :testing123/kw

Diagnosis
The zipper options are intended to be stored as metadata on the zipper.
This is not-working/lost for :track-position? zippers.

Action
I shall dig in and follow up with a fix.