Release D 2.087.0

[Vladimir Panteleev]

On Monday, 15 July 2019 at 11:33:44 UTC, Mike Franklin wrote:
> I discussed that briefly on Slack with a couple other 
> developers.
>  My understanding is the `rt` is the language implementation 
> and `core` is the low level library for users.
>
> The code in `rt/array` are language implementations.  They are 
> not to be imported by the user.  They are, however, required by 
> the language to implement D's built-in arrays, so that is why 
> they are publicly imported in object.d.

I think that fits core.internal better than rt. Have you 
considered that during said discussion?