undo-moreDefines a new undo element format (fun . args), which means “undo by applying fun to args”. For spreadsheet buffers, it allows undos in the data area even though that’s outside the narrowing.
copy-region-as-killWhen copying from the print area of a spreadsheet, treat the region as a rectangle and attach each cell’s formula and printer as ’ses properties.
yankWhen yanking into the print area of a spreadsheet, first try to yank as cells (if the yank text has ’ses properties), then as tab-separated formulas, then (if all else fails) as a single formula for the current cell.