Consider this code:
string func(in string[] args) {return args.join(" "); // compile error, args is not an input range
}It is somewhat expected as you can hardly popFront on a const range. But then question is: how can I wrap const slice into a mutable range without copying data (using standard language/library solution)? Of course, I can do .dup.join, but there is no real need to do copy, even a shallow one.