[swift-evolution] Final by default for classes and methods

[Tino Heth]

> - 'private' and 'internal' methods are not exposed outside of a library, so you can't call them, much less override them. Similar for 'private' and 'internal' classes: you cannot subclass them.
really important point — and imho one of the best arguments not to make final the default:
It IS already the default (practically), so all points regarding own frameworks used by other parties become much less relevant.
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