Also, just a quick note on terminology:

my %myhash = ();

$myhash{'ABC'} = 10;
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• key: The 'ABC'portion of $myhash{'ABC'}
• value: The value stored in the hash by that key; in this case, 10
• hash: The whole structure %myhash

When you use the term 'hash' to mean the 'value', it can cause confusion when someone is reading your description. I find it helpful to use distinct terminology for each element or aspect of a thing, if possible.