local our %copy;
*copy = \%hash;

[download]

should be 

our %copy;
local *copy = \%hash;

[download]

Or if you prefer, 

local *copy = \%hash;
our %copy;

[download]

What's the point of localizing %copy? Depending on whether you do it before or after the aliasing, you either localize a variable you never use, or you localize %hash.

But you do modify *copy, so you should localize that.

I want to know what package does those hash textgraphs you posted.

Notepad.

In reply to Re^2: Shallow vs deep copy (Was Re^3: hash ref mind blow) by ikegami
in thread hash ref mind blow by Anonymous Monk

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