Usability of "allMembers and derivedMembers traits now only return visible symbols"

[Martin Nowak via Digitalmars-d]

On Sunday, 4 September 2016 at 03:21:05 UTC, Stefan Koch wrote:
> While I do understand, that there could be a potential 
> performance when  private members could be changed around 
> because they are not visible form outside.
>
> I fail to see how we would take advantage of that without 
> breaking our object-model.

It's mostly about linkage of private methods.