Fast reflection for ActionScript, based on describeTypeJSON function
See http://tillschneidereit.net/2009/11/22/improved-reflection-support-in-flash-player-10-1/
The main limitation of the avmplus.describeTypeJSON function is that it can only be applied to instances.
RObject internally uses describeTypeJSON function where possible and falls back to parsing XML output of flash.utils.describeType
function, providing compatible object descriptor.
Usage
var flags:int = R.VARIABLES | R.METADATA | R.TRAITS;
var descriptor:RObject = R.describe(test, flags);