Opposite of Optional<T>.take() to set to .some value iff nil

[YOCKOW]

Sorry for derailing...

@Nobody1707

Which is a completely different operation.

My implementation is to return input as output if self is not nil. That's not exchange:

@YOCKOW

case .some(let alreadyWrapped):
  self = .some(alreadyWrapped)
  return newValue

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@ksluder

Optional.take() was apparently defined before SE-0429 landed.

I admit I was too circumstantial in a roundabout manner.
I just wanted to say we'd better to consider copy-ability to name the function.