I can't say I know all the intricacies, but my rul...

# announcements

[andrewoma]

I can't say I know all the intricacies, but my rule of thumb is to use projections when you want to receive something where you don't care about its type parameters. You can't create a type with a projection. e.g.

val foo = ArrayList<Any?>()
    val baz: ArrayList<*> = foo 
    val bar = ArrayList<*>() // Not valid