ProtoObject: DIP feedback

[Mike Parker]

On Friday, 29 October 2021 at 09:27:47 UTC, Robert Aron wrote:
> Hello everyone,
>
> This is the [ProtoObject 
> DIP](https://github.com/Robert-Aron293/DIPs/blob/master/DIPs/1NNN-RA.md).
> If you have any feedback, please use this thread or the 
> [PR](https://github.com/dlang/DIPs/pull/219) to tell me.
>
> Thanks!

All feedback during Draft Review should go in the pull request 
thread.