[swift-evolution] Proposal: Replace ?? by an (optional) argument to ?

[Rob Mayoff]

`x?(false)` already has a meaning. If `x` is of type `Optional<(Bool) ->
()>`, then `x?(false)` means “if x is None, do nothing; if x is Some(f),
call f(false)”.

I don't think the end is "the most important position", and I don't think
the default value is necessarily "the least important part of the
expression".

I like the existing ?? operator more than this idea.
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