5 - test (now fixed) /dev/tape/ links
7 - /run/udev/control socket
8 (add ConditionVirtualization=!pidns)
10 - move udevd -> --libexecdir
12 - allow path_id, usb_id, usb_db, pci_db as built-in?
14 - kill rules_generator:
15 - no longer rename netifs in kernel namespace
16 - drop persistent optical names
17 - do not create rules on-the-fly, require explicit configuration
18 for netifs and optical drives
19 - properly document what system management needs to put
22 - move udevadm -> --bindir
24 - remove deprecated trigger --type=failed logic
26 - remove deprecated BUS=, SYSFS{}=, ID= keys
28 - remove RUN+="socket:"
32 - libudev: return proper errno or set errno