I think the concern is that if you take an IonValue and cast it to IonText, then call stringValue(), you'll get an exception somewhere if the document contained

I think the concern is that if you take an IonValue and cast it to IonText, then call stringValue(), you'll get an exception somewhere if the document contained a null value. It recalls the nullability arguments between the ML family and the C/Java family. kazinator is asking for safer document semantics and a type-safe API.