src/main/java/org/nustaq/serialization/FSTObjectOutput.java
protected FSTClazzInfo getFstClazzInfo(FSTClazzInfo.FSTFieldInfo referencee, Class clazz) {
        FSTClazzInfo serializationInfo = null;
        FSTClazzInfo lastInfo = referencee.lastInfo;
        if ( lastInfo != null && lastInfo.getClazz() == clazz && lastInfo.conf == conf ) {
            serializationInfo = lastInfo;
        } else {
            serializationInfo = getClassInfoRegistry().getCLInfo(clazz, conf);
            referencee.lastInfo = serializationInfo;
        }
        return serializationInfo;
    }
protected FSTClazzInfo getFstClazzInfo(FSTClazzInfo.FSTFieldInfo referencee, Class clazz) {
        FSTClazzInfo serializationInfo = null;
        FSTClazzInfo lastInfo = referencee.lastInfo;
        if ( lastInfo != null && lastInfo.getClazz() == clazz && lastInfo.conf == conf ) {
            serializationInfo = lastInfo;
        } else {
            serializationInfo = getClassInfoRegistry().getCLInfo(clazz, conf);
            referencee.lastInfo = serializationInfo;
        }
        return serializationInfo;
    }
if class is same as last referenced, returned cached clzinfo, else do a lookup