Extending D's support for object-oriented design with private(this)

[Richard (Rikki) Andrew Cattermole]

On 26/04/2024 12:55 AM, Lance Bachmeier wrote:
> This introduces a more restricted version of private. Overloading 
> `private` to give it a second meaning is going to cause confusion for 
> new users and really anyone that doesn't use D's OOP all the time. I 
> recommend using something like `hidden` or `strongprivate`.

Hidden is used as an attribute, defined as a UDA in ``core.attributes``. 
It is related to exportation, so that is already taken.