Some findings from playing with launch arguments:

Some of you might know you can override NSUserDefaults with launch args

This doesn& #39;t just apply to the standardUserDefaults, it also applies to shared defaults in App Groups

But what about the following scenario? Would you expect an int or a string?

By default, Foundation will translate launch args to a string. You can specify types with __blank__(forKey:) APIs for simple types, but you can also specify the type in the launch arg itself

Dictionaries/Arrays a fair game, just think plist xml styling