But for a special class of “builtins”, the compiler seems to look in the current package, *then the builtins*, then any explicitly-imported package. You can find these builtins here:
https://github.com/JetBrains/kotlin/tree/master/core/builtins/native/kotlin

Of course now in Skip, we've added special logic so that if you use a Swift type (from the std libraries or your own) that matches one of these builtin names, we’ll import the full type name for you rather than just 'package.*'
https://skip.tools

/Thread