// CollectionCreate defers to railsProxy for everything except blob
// signatures and vocabulary checking.
func (conn *Conn) CollectionCreate(ctx context.Context, opts arvados.CreateOptions) (arvados.Collection, error) {
// CollectionCreate defers to railsProxy for everything except blob
// signatures and vocabulary checking.
func (conn *Conn) CollectionCreate(ctx context.Context, opts arvados.CreateOptions) (arvados.Collection, error) {