.NET on a string

[Georg Wrede]

Walter Bright wrote:
> Cristi talks about adapting D strings to .NET.
> 
> http://www.reddit.com/r/programming/comments/84urf/net_on_a_string/?already_submitted=true 
> 

Actually, meant to ask earlier, but

"[...in .NET,] System.Array and System.ArraySegment are distinct, 
unrelated types. In D arrays slices are indistinguishable from arrays 
and this creates the problems that I mentioned in the interview."

Is this discussed somewhere?

The idea of slices and arrays being distinct types does seem to have 
advantages. I've seen a couple of mentions of this lately, but has there 
been a *rigorous* discussion?