Why is D unpopular

Mon Jun 13 10:55:36 UTC 2022

On Monday, 13 June 2022 at 10:51:10 UTC, Mike Parker wrote:
> And I'm arguing that this is exactly what we should expect from 
> private-to-the-module, since B is not declared in the same 
> module as the superclass, so it's neither unfinished nor a bug.

It breaks the sub-typing requirement.

If you get more access by recasting a pointer to the super-type 
then the sub-typing relation cannot be satisfied.

Hence, it is certainly broken. If it is not a bug, then it is 
broken by design. Which is no better.