message: Add a Debug instance for NoneOr
  Summary: Most types deserve them.
diff: @@ -68,6 +68,7 @@ impl AllocFrozenValue for NoneType {
  }
  /// Equivalent of a Rust [`Option`], where [`None`] is encoded as [`NoneType`]. Useful for its [`UnpackValue`] instance.
  +#[derive(Debug)]
  pub enum NoneOr<T> {
  None,
  Other(T),
  