The following reflection warnings are reported when using data.json - I was given the impression that "standard" (i.e., new contrib) libraries shouldn't have any:

Reflection warning, clojure/data/json.clj:36 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:37 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:51 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:53 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:55 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:90 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:91 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:92 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:93 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:94 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:95 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:105 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:106 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:129 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:132 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:140 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:148 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:157 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:160 - call to equiv can't be resolved.
Reflection warning, clojure/data/json.clj:278 - reference to field
isArray can't be resolved.
Reflection warning, clojure/data/json.clj:346 - reference to field
isArray can't be resolved.