in other adapters this is implemented as an option, see e.g.
https://github.com/garak/Gaufrette/blob/e5a3c5a71ce1c8ab68a47f7d5e8031a0b7e5a469/src/Gaufrette/Adapter/Ftp.php#L48

I think we could implement it in this class also this way, because otherwise the constructors gets longer with every argument added...