in reply to Re^2: saving nested arrays in a hash
in thread saving nested arrays in a hash

$ref1 = \@arr;
$ref2 = \@arr;

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The two references both point to the same underlying data structure.

$ref1 = [ @arr ];
$ref2 = [ @arr ];

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The two references each point to different anonymous arrays, which have the same values as @arr, but are different structures.

As Occam said: Entia non sunt multiplicanda praeter necessitatem.

In Section Seekers of Perl Wisdom