I hesitate to mention this, but in this particular example (certainly not every example - and this probably isn't an advisable way to do it), the sub wouldn't need to have an arrayref passed, technically.

sub somesub {
    my $first = shift;
    my @second = @_;
    my $third = pop @second;
}
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Granted, this doesn't help the OP with his problem, but a couple of people mentioned that it wasn't possible to have a flattened array in the middle of the arguments, when in a crazy way, it is possible.

    -Bryan