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$option_line = join ' ', @ARGV; #reconstitute
my @pairs = $option_line =~ m/(\w+:\s+\w+)/g; # grab option pairs
...
    # save each pair in hash
    $option{$name} = $value;
}

our %opt_hash; #can't use my
use Getopt::Declare;
...
    [repeatable]
};
# untested