AUndefined
ANull
ABool(b:Bool)
AInt(i:Int)
ANumber(f:Float)
AString(s:String)
ADate(d:Date)
AObject(fields:Map<String, Value>, size:Int, classname:String)
AArray(values:Array<Value>, extra:Map<String, Value>)
AVector(values:Vector<Value>, classname:String)
AXml(x:Xml)
ABytes(b:Bytes)
AMap(m:Map<Value, Value>)