Holds a spreadsheet identifier, i.e. a string. This is what the
Sheets and Drive APIs refer to as spreadsheetId and fileId,
respectively. Any object of class sheets_id will also have the
drive_id class, which is used by googledrive for
the same purpose.
This means you can pipe a sheets_id object straight into
googledrive functions for all your Google Drive needs that have nothing
to do with the file being a spreadsheet. Examples: examine or change file
name, path, or permissions, copy the file, or visit it in a web browser.