> The one issue I see is sticking that public extension inside a private one.
> I think you would have to mark ‘secret: Int’ as private instead of the
> extension itself to allow the effect you are looking for…
I didn't think that much while writing the example, but this one was actually
on purpose:
It's stated in the Swift documentation that the default visibility of members
in an extension equals the level of the extension — so this use of extensions
is also a way to group all public declarations (the other levels as well), and
save some keystrokes.
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