Before patch:
`
user=> (definterface I (f []))
user.I
user=> (def p (proxy [Object I] [] (f [] 1)))
'user/p
user=> (definterface I (f []))
user.I
user=> (def p (proxy [Object I] [] (f [] 1)))
'user/p
user=> (.f ^I p)
ClassCastException user.proxy$java.lang.Object$I$383c225e cannot be cast to user.I user$eval7491.invokeStatic (:1)
`
After patch:
`
user=> (definterface I (f []))
user.I
user=> (def p (proxy [Object I] [] (f [] 1)))
'user/p
user=> (definterface I (f []))
user.I
user=> (def p (proxy [Object I] [] (f [] 1)))
'user/p
user=> (.f ^I p)
1
`
Cause: proxy caches the generated class using a set of classnames (see https://github.com/clojure/clojure/blob/master/src/clj/clojure/core_proxy.clj#L280-L286), this is not safe under redefinition of interfaces
Proposed: change the hashing function used to determine proxy class cache hits to take into account the identity of each interface/super class rather than just their name
Patch: 0001-CLJ-2379-idempotent-proxy-name-just-on-identical-ins-v2.patch
