[swift-evolution] Proposal: Require explicit modifier for statically dispatched extension methods (was: Universal dynamic dispatch for method calls)

[Brent Royal-Gordon]

> The details of the solution are tricky, but I like this general approach with “final” (or whatever the right keyword is). It passes the smell test for me.

I’ve written up a draft of about half of a formal proposal at <https://github.com/brentdax/swift-evolution/blob/master/proposals/0000-require-final-on-protocol-extension-methods.md>. It provides a bit more detail and hopefully a more complete rationale for why I favor the design I’ve proposed.

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Brent Royal-Gordon
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