[swift-evolution] [Proposal] Allow protocols to require functions with default parameter values.

[Vatsal Manot]

Currently, the following the code fails with multiple errors:

protocol Protocol
{
    typealias Argument
    
    func function(argument: Argument = default)
}

I propose that we allow protocols to require functions with default parameter values. I can’t see any disadvantages to this, and the change would only be additive.