Your problem here is that you're taking a reference to the array and then dereferencing it in the subroutine getting back the original array.

Instead of

my $myarrayref = \@myarray;
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try doing

my $myarrayref = [@myarray];
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Take a look at perlref for a discussion of how this works; if that seems a little advanced for you, try the tutorial: perlreftut.