ExactArgs returns an error if there are not exactly n args.

ExactArgsObjectID returns an error if there are not exactly n args and any of those args is not an ObjectID.

ExactValidArgs returns an error if there are not exactly N positional args OR there are any positional args that are not in the `ValidArgs` field of `Command`.

MaximumNArgs returns an error if there are more than N args.

MinimumNArgs returns an error if there is not at least N args.

MinimumNObjectIDArgs returns an error if there is not at least N args and any of those args is not an ObjectID.

NoArgs returns an error if any args are included.