You can't easily return an array and a scalar - the array is going to consume all the returned values (the scalar included).

In this case it's best to just return a ref to the array as well as the scalar like so:

sub do_something
{
    ...
    return \@someValues, $someValue;
}

($someValues_aref, $endValue) = do_something();
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Without using references you would have to do something like this:

(@someValues) = do_something();
$endValue = pop(@someValues);
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Messy, but it would get the job done.