cloning array

[Sean]

Hello

I have seen this : 
https://forum.dlang.org/thread/1473526717.1917.20.camel@winder.org.uk

Now, please consider this code:


import std.stdio;
import std.math;
import std.stdio;
import std.conv;
import std.format;
import std.math;
import std.algorithm;
import std.net.curl;
import std.json;
import std.path;
import std.array;
import std.net.curl;
import core.stdc.stdlib;
import std.datetime;
import std.file;





void main() {

         auto a = new double[][] (0,0);
         a ~= [ 1.0, 2.45];
         a ~= [ 4.9 ,28, 9];



         auto b = a.dup;

         a[1] = remove(a[1],1);

         writeln(b);
}



I compile with dmd version :

DMD64 D Compiler v2.096.1

Copyright (C) 1999-2021 by The D Language Foundation, All Rights 
Reserved written by Walter Bright


Output :


[[1, 2.45], [4.9, 9, 9]]


What I would expect :

[[1, 2.45], [4.9, 28, 9]], because i am copying the array `a` to 
a different place - at `b`.


Is this normal behavior of dup? if so, how can I get the behavior 
i am searching for? Thank you.