sorting a string

[Anton Fediushin via Digitalmars-d-learn]

On Friday, 14 July 2017 at 17:23:41 UTC, Steven Schveighoffer 
wrote:
> Don't do this, because it's not what you think. It's not 
> actually calling std.algorithm.sort, but the builtin array sort 
> property. This will be going away soon.

This sucks. I know, that `.sort` will be removed, but I thought 
it won't break any code.

> With 2.075, it won't compile even without the parentheses, 
> because a char[] is not an array according to std.algorithm...

But why? This should be true for `char[]`, isn't it?
-----
if ((ss == SwapStrategy.unstable && (hasSwappableElements!Range 
|| hasAssignableElements!Range) || ss != SwapStrategy.unstable && 
hasAssignableElements!Range) && isRandomAccessRange!Range && 
hasSlicing!Range && hasLength!Range)
-----
(It's from 
https://dlang.org/phobos/std_algorithm_sorting.html#sort)