[swift-evolution] Using `map` and `flatMap` with implicit optionals

[Nicholas Maccharoli]

Since `ImplicitlyUnwrappedOptional` types can be unwrapped with an `if let`
or
accessed as an optional as in `foo?.bar` then why shouldn't there be
implementations of `map` or `flatMap` for use with IUO types?

I think having `map` and `flatMap` available on types marked with "!" would
be convenient
but is there a good reason why that isn't the case now?
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