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

[Javier Soto]

This was brought up in a different thread about private by default.
Creating a new thread for this. Quoting Mathew from the other thread with a
short summary about the motivation behind this:

"It is not uncommon to have a need for a reference type without a need for
inheritance.  Superclasses should be intentionally designed to be
subclasses and the author required to opt-in to subclassing and member
overrides where that is required by the design."
-- 
Javier Soto
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