foreach ( 0 .. $key_next ) {
ok( $o->set( "key-$_" => $_ ), "set key-$_" );
cmp_ok( $o->get( "key-$_" ), 'eq', $_, "get key-$_" );
cmp_ok( $o->incr( 'key-next' ), '==', $_ + 1, 'incr' );
foreach ( 0 .. $key_next ) {
ok( $o->set( "key-$_" => $_ ), "set key-$_" );
cmp_ok( $o->get( "key-$_" ), 'eq', $_, "get key-$_" );
cmp_ok( $o->incr( 'key-next' ), '==', $_ + 1, 'incr' );