I got it. Thanx.
And it's not ineffective, I'd say,
By inefficient, I mean that I have to iterate through all of the keys to add that sub with the key or a reference to the container manually, but I figure that object does it automatically. Again, I understand that I still need to read perl object tutorials, so I might be wrong at something yet.
@l = (1...3);
I guess, this is? 
@l = (1..3);

[download]
or it's some operator that I am not aware of?

In reply to Re^4: How to detect a hash container key from a referenced sub value by igoryonya
in thread How to detect a hash container key from a referenced sub value by igoryonya

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