How to create a mutable array of strings?

[Dennis Ritchie via Digitalmars-d-learn]

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

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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);
}
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http://rextester.com/QBFH12695

P.S. Need to enable deepDup in Phobos.