serialised : {"assignee":"u-42","title":"Fix build"}
round-trip : Ticket[assignee=UserId[value=u-42], title=Fix build]
equal      : true
no module  : MismatchedInputException - Cannot construct instance of `com.ankurm.jackson3.part4custom.E06ValueDeserializerDirect$UserId` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('u-42')