Maybe

Wraps a value in Maybe, treating null (and the Absent sentinel) as absent.

Unlike present, apply collapses null/Absent to Maybe.absent. Use present when the value being wrapped is itself a Maybe that may be absent.

Wraps a value in Maybe, preserving present-ness even for null or Absent.

A non-null/non-Absent value is returned as-is (zero allocation). A null value is wrapped as Present(null), and the Absent sentinel is wrapped as Present(Absent); both are distinguishable from Maybe.absent (the Absent singleton). This is what makes nested Maybes sound: Maybe.present(Maybe.absent) is Present(Absent), not Maybe.absent.

Special case for soundness (see Present scaladoc): if the argument is itself a Present[_], it is wrapped in an extra Present layer so that unsafeGet returns the original Present (preventing CCE when A = Present[T]). Normal present(v) for non-Present v remains zero-alloc.