Gets the value if not null. If this is in the null state, and the optional
parameter fallback was provided, it will be returned. Without fallback,
calling get with a null state is invalid.
When the fallback type is different from the Nullable type, get(T) returns
the common type.
Gets the value if not null. If this is in the null state, and the optional parameter fallback was provided, it will be returned. Without fallback, calling get with a null state is invalid.
When the fallback type is different from the Nullable type, get(T) returns the common type.