Given that an optional type can be represented by a non-optional generic parameter, how can you tell the difference between Optional<T>.none and nil?

[young (rtSwift)]

@1oo7

provide a new unwrapping symbol (alternative to ! or ? ) that removes all levels of optional wrapping from a value, no matter how many there are (greedy unwrapper to match the behavior of nil literal assignment)

Take a look: Challenge: Flattening nested optionals