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# this is in a loop that iterates through the file
# and at some point it runs across:
...
                                $hash{$1} = split /,/, $2;
                                next;
                                };

Use of implicit split to @_ is deprecated

      /(\S+)\s?=?\s?\[(.+)\]$/  && do {
                                $hash{$1} = @{[ split /,/, $2 ]};
                                next;
                                };