After considering JSR-310 types to be simple we map these types primarily to java.util.Date as the majority of stores does not natively support JSR-310 types. Converters referencing JSR-310 types are now properly annotated with Reading/WritingConverter annotations to distinguish between reading and writing intents.
Othwerise, converters between JSR-310/java.util types and Joda/ThreeTenBackport to JSR-310 types interfere with conversion as regular java.util.Date types would convert to e.g. LocalDateTime.