in reply to multiple passes by reference
$hash gives you the same thing as \%$hash.
In convoluted English: the hashref will give you effectively the same thing as a reference to the hash pointed to by the hashref.
Update: Attend to dws, I tried to stick with your
var name, but there is a world of grief to be avoided
by naming your vars so you really know what you have.
$hashref is much more helpful than $hash
when you come back to the code a month later.
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