Merging one Array with Another

[via Digitalmars-d-learn]

On Wednesday, 6 May 2015 at 16:05:15 UTC, Andrea Fontana wrote:
> Maybe a way like this could be useful:
> http://dpaste.dzfl.pl/7b4b37b490a7

If r is a SortedRange this is very unneccesary wasteful because 
of the use AA.

In that case you, instead, only want to remove equal consequtive 
elements without the need for any AA.

I'm guessing there's already an algorithm for this somewhere in 
Phobos.

Ideas anyone?