dup and arrays

Ellery Newcomer ellery-newcomer at utulsa.edu
Fri Mar 26 17:42:01 PDT 2010

I just noticed that dup does not dup deep.

In a two second search I couldn't find any reason for or against, but 
I'd kinda like it if

auto r2 = r.dup;
r2[i][j] = 0;
r[i][j] = 1;
assert(r2[i][j] != r[i][j]);


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