options/dag.go
func (dagOpts) Kind(kind string) DagPutOption {
	return func(opts *DagPutSettings) error {
		opts.Kind = kind
		return nil
	}
}
func (dagOpts) Kind(kind string) DagPutOption {
	return func(opts *DagPutSettings) error {
		opts.Kind = kind
		return nil
	}
}
// Kind is an option for Dag.Put which specifies the format that the dag
// will be added as. Default is "cbor".