I notice ArrayBag? (tango.util.collection.ArrayBag?) deprecated. I like it, what is used in place of it, (and possibly how do I use the replacement, eg. example). Thanks.
The tango.core.Array module doesn't define an array container or anything, it just adds utility functions that you can use with the built-in arrays. Not sure if that's what you meant.
As for using the index with foreach with tango container classes, I don't know if they support that or not. Just try it, and update the index manually if it doesn't work.