I remembered code Ali Çereli. It really helped:
http://forum.dlang.org/thread/ulhtlyxxclihaseef...@forum.dlang.org#post-mihl6m:241che:241:40digitalmars.com

-----
import std.stdio, std.traits, std.range, std.algorithm;

auto deepDup(A)(A arr)
        if (isArray!A)
{
        static if (isArray!(ElementType!A)) {
                return arr.map!(a => a.deepDup).array;
                
        } else {
                return arr.dup;
        }
}

void main() {

        auto s = ["foo", "bar"].deepDup;

        s[1][1] = 't';

        writeln(s);
}
-----
http://rextester.com/QBFH12695

P.S. Need to enable deepDup in Phobos.

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