As mentioned by Steve on the forum, the JavaTypeDescriptorRegistry allows us to register a JavaTypeDescriptor which can handle a certain Java entity property type so that custom types implemented via AttributeConverter can be auto-discovered by Hibernate.
We need to document this process based on the example offered in the Hibernate forum attached at the beginning of this issue.
FYI, registering a custom domain type is just part of the equation here. Similarly we can register a custom SqlTypeDescriptor. Together these offer extendability beyond just AttributeConverter.
Started in the `design/type-customization.adoc` document which is intended to be the start of a documentation chapter for this