Thought I would post this as I can never track down this information via livedocs.

Here's what data type ColdFusion variables get converted to in ActionScript when making remote calls to CF services:

ColdFusion data type      ActionScript data type

String                    String 

Array                     Array 

Struct                    Untyped Object 

Query                     Array of untyped Objects 

CFC Class                 typed Object 

CFC Date                  ActionScript Date 

CFC String                ActionScript String 

CFC Numeric               ActionScript Numeric 

ColdFusion XML Object     ActionScript XML Object