options/dag.go
func (dagOpts) Pin(pin string) DagPutOption {
	return func(opts *DagPutSettings) error {
		opts.Pin = pin
		return nil
	}
}
func (dagOpts) Pin(pin string) DagPutOption {
	return func(opts *DagPutSettings) error {
		opts.Pin = pin
		return nil
	}
}
// Pin is an option for Dag.Put which specifies whether to pin the added
// dags. Default is "false".