• 1.这个问题的应对方法是使用一个用作数组容器但是没有扩展INOUT _ HOLDER的自定义类。
  The workaround to this problem is to use a custom class that ACTS as a container for the array but does not extend INOUT_HOLDER.
  dict.yoduao.com
• 2.常见的基本类型有string、integer和boolean，不过，后面将看到还能将元素映射为数组或自定义类。
  Common primitive types are string, integer and Boolean; however, as you'll see a little further along in this article, you can also map an element to an array or a custom class.
  dict.yoduao.com
• 3.Rails同时为许多其他对象提供了合理的blank ？定义：true, false，空数组及哈希表，数值类型，甚至是Object类本身。
  Rails provides reasonable definitions of blank? For several other objects too: true, false, empty arrays or hashes, numeric types, and even the object class.
  dict.yoduao.com

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