Proof using.
intros.
unfold json_serialize, json_deserialize.
cheerios_crush.
rewrite treeify_untreeify_id.
cheerios_crush.
Qed.
Instance json_Serializer : Serializer json.t.
End tag.
Definition string_eqb s s' :=
if (String.string_dec s s') then true else false.

Lemma string_eqb_true : forall s s', string_eqb s s' = true -> s = s'.
Proof using.