paredit fns throw on invalid clojure but valid rewrite-clj constructs

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Version
1.1.49

Platform
All

Symptom
The paredit API will throw when it is inspecting certain valid rewrite-clj constructs.
An example of an invalid clojure but valid rewrite-clj construct is an unbalanced map: {:a}.

Reproduction

(-> "{:a} :b"
    z/of-string
    pe/slurp-forward
    z/root-string)

Actual behavior

;; => Execution error (IllegalArgumentException) at rewrite-clj.node.seq/eval12858$map-seq-fn (seq.cljc:107).
;;    No value supplied for key: :a

Expected behavior
This should be a noop for slurp:

;; => "{:a} :b"

Diagnosis
Paredit is using sexpr internally. We'll stop doing that.

Action
Looking at it.