code: func (c *Manager) FindLibraryItems(
  	ctx context.Context, search FindItem) ([]string, error) {
  
  	url := internal.URL(c, internal.LibraryItemPath).WithAction("find")
  	spec := struct {
  		Spec FindItem `json:"spec"`
  	}{search}
  	var res []string
  	return res, c.Do(ctx, url.Request(http.MethodPost, spec), &res)
  }
docs: // FindLibraryItems returns the IDs of all the library items that match the
  // search criteria.