[swift-evolution] [Proposal] Sealed classes by default

[Brent Royal-Gordon]

> If we're going to go along those lines, we should just use public(subclassable) and public(overridable).  We can fall back on those if necessary; I would just like to continue looking for better alternatives.

I would prefer to have a *single* keyword which meant both public and overridable. That would minimize the impact of this feature—instead of writing:

	public class MyViewController: UIViewController {
		public func displayMe(_ me: person) { … }
	}

You'd write (strawman keyword):

	openseason class MyViewController: UIViewController {
		openseason func displayMe(_ me: person) { … }
	}

And then `MyViewController` could be subclassed, and `displayMe` overridden.

-- 
Brent Royal-Gordon
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