Interface for Upcasters. An upcaster is the mechanism used to convert deprecated (typically serialized) events from
the eventstore and convert them into the current format. If the serializer itself is not able to cope with the
changed formats (XStream, for example, will allow for some changes by using aliases), the Upcaster will allow you to
configure more complex structural transformations.
<> The data format that this upcaster uses to represent the event
- Allard Buijze