Sort description how we have extended JSON to support some objects like Date.

           JSON                |        JavaScript     |                             Description
-------------------------------+-----------------------+---------------------------------------------------------------------------
 "Hello"                       | "Hello"               | If it doesn't end ")" or doesn't have "(", it can be presented normally
 "Date(1287197914000)"         | Date(1287197914000)   | Date object
 "String(Date(1287197914000))" | "Date(1287197914000)" | String object
 "UIMessage(OK)"               | UIMessage(...)        | Custom object
-------------------------------+-----------------------+---------------------------------------------------------------------------

File ../lib/json/jsonobject.js contains the JavaScript implementation.