$vos->release ( id => $id, cell => $cell, ( $vos->supportsArgument('release','force') ? ( force => 1 ) : ( f => 1 ) ), );
OK, that's the authors twisted way of doing it, and it seems like needless complexity. Both f and force are now supported as options, using a simply alias mechanism to translate from one to the other, based on what is supported by the vos binary.
The documentation hasn't been changed, since you can use 'force' in all cases, and since that is the newer of the two, the docs will stay as they are. The fact that your vos binary really wants 'f' is hidden from you, and will stay that way.