if we work with the same key with REST and memcached client at once, a server side class cast exception occurs because both work with different value representation:
SERVER_ERROR java.lang.ClassCastException: [B cannot be cast to org.infinispan.server.memcached.MemcachedValue
SERVER_ERROR java.lang.ClassCastException: [B cannot be cast to org.infinispan.server.core.CacheValue

this happens when both server modules use shared cache manager