Feedback per API scrub, to be done before alpha if possible:

Make version with two buttons slots always be auto by default
Remove AlertDialogButtonStrategy enums, as it will be auto in two slots and in one buttons slot people will be able to make it as they like
Rename onCloseRequest to onDismissRequest for consistency with other APIs
clarify in the docs what gets called when back button pressed and when touched outside. Do they both trigger onDismissRequest?
Expose backgroundColor and contentColor as params.