I'm trying to use Reddit::Client to get my reddit messages

The method is get_inbox() and that works just fine, but it only gets page one of the inbox. Logically, knowing what I know about Reddit, I should be able to add an after param to the args, and indeed looking at the source that seems right:

sub get_inbox {
    my ($self, %param) = @_;
    my $limit   = $param{limit}       || DEFAULT_LIMIT;
    my $mode    = $param{mode}        || MESSAGES_INBOX;
    my $view    = $param{view}        || MESSAGES_INBOX;

    my $query = {};
    $query->{mark}   = $param{mark} ? 'true' : 'false';
    $query->{sr_detail} = $param{sr_detail} if $param{sr_detail};
    $query->{before} = $param{before} if $param{before};
    $query->{after}  = $param{after}  if $param{after};
    [... more code snipped ...]
}
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But when I add an 'after' param to my call to the sub, nothing changes:  $reddit->get_inbox( [ view => MESSAGES_MESSAGES, after => 'reddit_id_here' ] );

Also wait, why are the params being sent in an array ref, not a hash or hash ref? And why when I do this to the actual source code of the module:

sub get_inbox {
    my ($self, %param) = @_;
    my $limit   = $param{limit}       || DEFAULT_LIMIT;
    my $mode    = $param{mode}        || MESSAGES_INBOX;
    my $view    = $param{view}        || MESSAGES_INBOX;
### I ADDED THIS CODE TO DEBUG:
print Dumper(\%param);
exit();
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Does Data::Dumper show me an array which isundef? Shouldn't everything from the args be in a hash? Instead I get

$VAR1 = {
    'ARRAY(0x7ffbb4ba2768)' => undef
};
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I've had quite a few Christmas drinks over the last few days, but I'm obviously missing something here. The documentation is wrong? The subroutine is failing to get the args into %param? TIA for anyone who can help me out!