message: Remove `Default` trait for object types
diff: @@ -6,7 +6,7 @@ pub use serialization::{
  deserialize_another_type, read_another_type, serialize_another_type, write_another_type,
  };
  -#[derive(Clone, Debug, Default, Deserialize, Serialize)]
  +#[derive(Clone, Debug, Deserialize, Serialize)]
  pub struct AnotherType {
  pub prop: Option<String>,
  pub circular: Box<Option<CustomType>>,
  