It doesn't only apply to DBI: it currently only works with DBI & Net::LDAP handles (and the two are handled differently by the code). I did think about a DBI::* namespace, but as well as also supporting LDAP it's intended to develop to cover as many data source types as possible. I'm open to rename suggestions, but I wanted to use as descriptive and general a name as possible.

/me slaps forehead - behaviour isn't defined for length and type mismatches. Those are going on the TODO list now and will be addressed ASAP.

In theory you should be able to go from one RDBMS type to another - I've run from SQLite->LDAP, LDAP->SQLite, and LDAP->DBD::CSV so far.