zfs 0.7.7 unsafe?

Hi I notice that proxmox is offering me 0.7.7 versions of ZFS packages. I was under the impression that these weren't safe and the OpenZFS devs advise to not use them. Is this the case for proxmox? Updated 4/9/18: We've found a serious regression in 0.7.7 (#7401). Please use 0.7.6 or 0.7.8...