public static Map getInnerMap(Map object) {
        if (CLASS_JSON_OBJECT_1x == null || !CLASS_JSON_OBJECT_1x.isInstance(object) || FIELD_JSON_OBJECT_1x_map == null) {
            return object;
        }

        try {
            object = (Map) FIELD_JSON_OBJECT_1x_map.get(object);
        } catch (IllegalAccessException ignore) {
            // ignore
        }

        return object;
    }
decimal is integer, check has non-zero small

@param decimal
@return
core/src/main/java/com/alibaba/fastjson2/util/TypeUtils.java