Maximum value count for multivalued attributes

[Fox Flanders]

I'm trying to retrieve the list of members in an AD group using perl-ldap.
It works fine with a small number of people in a group.  But when doing a
get_value() on an attribute with say 1000 values, like a large Active
Directory group with attribute "member", I get 'undef' from get_value().
Does anyone know what the value count limit is, and is there a way to extend
it?

    my (@member) = $entry->get_value("member");

Thanks,
Fox