OptionalNullableTyperT
OptionalNullableTyperT is a generic type concept used to model a three-state value for a type parameter T. It represents a container that can be absent, explicitly null, or contain a non-null value of type T. The idea combines the notions of optionality (present or missing) and nullability (explicit null), producing a distinct third state.
In formal terms, OptionalNullableTyperT<T> is often described as a sum type with three variants: Absent, Null,
Construction and usage vary by language. In a language with discriminated unions, you would declare three variants
Common use cases include parsing JSON responses, interfacing with external services, and representing optional dependencies where