static void checkArgument(boolean condition) {
        if (!condition) {
            throw new IllegalArgumentException();
        }
    }
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