Oh, this is a private method. The actual public method would look something like:

sub my_public {
    my $self = shift;

    my @args = $self->coerce_args('ARRAY', @_);

    ....
}
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Or, that could be a hash. The thing was that I couldn't imagine wanting to have anything other than a list(ref) or hash(ref), but I didn't want to limit myself to those, unless those were the only possibilities at all. Maybe I was being too generic?