[swift-evolution] [Proposal] Make optional protocol methods first class citizens

[Yuval Tal]

Hi,

I find that optional protocol methods to be very useful. However, there is
a caveat -- it needs to be mapped to @objc. This puts a set of limitations,
such as: structures cannot be used as parameters as it does not map to
objective-c. What do you think about removing the requirement of using
@objc and allow to create optional methods without these limitations?

Thank you,

-Yuval
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