in reply to what is keys %$hash_ref [-1]
The fragment you have shown will not compile. The following will compile:
(keys %$hash_ref)[-1]... and will return the "last" key of hash %$hash_ref. But that would seem somewhat meaningless, as the keys of a hash do not have any specific order. Any apparent order of the keys may change when the elements of the hash are changed, or a different Perl is used.
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