interface DenseSheet implements Sheetimport { type DenseSheet } from "https://dotland.deno.dev/x/lume@v2.2.1/deps/sheetjs.ts"; General object representing a dense Sheet (worksheet or chartsheet) Index Signatures[cell: string]: CellObject[][] | SheetKeys | anyProperties!data: CellObject[][]Dense-mode worksheets store data in an array of arrays Cells are accessed with sheet['!data'][R][C] (where R and C are 0-indexed)