public static void cleanupCache(Class objectClass) {
        if (objectClass == null) {
            return;
        }

        fieldCache.remove(objectClass);
        fieldMapCache.remove(objectClass);
        declaredFieldCache.remove(objectClass);
        methodCache.remove(objectClass);
        constructorCache.remove(objectClass);
    }
The WildcardType interface supports multiple upper bounds and multiple
lower bounds. We only support what the Java 6 language needs - at most one
bound. If a lower bound is set, the upper bound must be Object.class.
core/src/main/java/com/alibaba/fastjson2/util/BeanUtils.java