# Variables
AllPreferredGroupVersions returns the preferred versions of all registered groups in the form of "group1/version1,group2/version2,...".
Group is a shortcut to allGroups.Group.
GroupOrDie is a shortcut to allGroups.GroupOrDie.
RegisterGroup is a shortcut to allGroups.RegisterGroup.
# Type aliases
GroupMetaMap is a map between group names and their metadata.