Is it possible to have a transparent (by reference) std.string.representation?

It's handy to modify the chars, like with permutations:


import std.stdio: writeln;
import std.range: nextPermutation;
import std.string: representation;
void main() {
    char[] perm = "abcd".dup;
    do {
        writeln(perm);
    } while (nextPermutation(representation(perm)));
}



Currently to permute them you have to use dchars:


import std.stdio: writeln;
import std.range: nextPermutation;
void main() {
    dchar[] perm = "abcd"d.dup;
    do {
        writeln(perm);
    } while (nextPermutation(perm));
}



Or to use casts and ubytes:


import std.stdio: writeln;
import std.range: nextPermutation;
void main() {
    ubyte[] perm = cast(ubyte[])("abcd".dup);
    do {
        writeln(cast(char[])perm);
    } while (nextPermutation(perm));
}

Thank you,
bye,
bearophile