That's just a tag to tell the compiler about how it should treat the array in MXML layout. At runtime this information doesn't persist and it has no effect on how Array behaves. It will still be the same ECMAArray... Vectors do have the type information at runtime, however not after they are serialized. One more thing though. You may add custom meta tags if you need and store the RTTI there. If that's not good enough, I know there are an initiative to let compiler execute custom code during compilation... It's not yet there, but well may be that it is already workable enough to provide some sort of preprocessing / postlinking etc stuff, so you could inject the meta for example during compilation... (search JIRA for that, I cannot find the link atm.)
Best. Oleg
