Fix ArgBuilder derivation for case classes containing only optional fields #2408
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/fixes #2407
Issue was that we were treating all case classes as potential value types. Fix is to determine during compile-time whether the case class is a value type (either using annotations or checking if the case class extends
AnyVal
)@guymers I also added the tests that were in #2403 to ensure that
oneOf
input derivation is working as expected now.