Jackson subtype schema unions are non-deterministic and therefore incompatible with each other. #601
Description
As a consequence of this change, the order of schema formats is no longer deterministic: 0d7f007
This means that two schemas that are generated in two separate runs are incompatible. The reason for this is the use of a Set for collecting unionSchemas. To solve the issue, there should be a separate list where types are stored in the discovery order to retain a deterministic order.