Concat concats errors exlucdes nil.

Empty returns an error if s is not empty.

EmptyStrings returns an error if the slice is not empty.

FromName returns ids from the name.

ID returns an error if s is not an id string.

NameOr returns an error if the name if not in the form of collection ids.

ProjectIncomingContext returns a project id from the incoming context.

Range returns an error if i is not in the range.