Spreadsheet.ReadAll

Name	Mandatory	Description	Default	Type
⬅️ Input		The input of the shard, if any		StringBytesWorkbook
Output ➡️		The resulting output of the shard		{Any}
HasHeaders	No	Dense layout only: treat the first non-empty row of each sheet as column headers. Default true.	true	Bool
Layout	No	Dense (header-keyed Seq of Tables) or Sparse (Int-keyed Table preserving cell coordinates).	SpreadsheetLayout::Sparse	SpreadsheetLayout
CellSource	No	Values (default): emit cached cell evaluations. Formulas: emit =<formula> strings where present, falling back to cached value.	SpreadsheetCellSource::Formulas	SpreadsheetCellSource

One-shot: read every sheet of a workbook (path|bytes|Workbook) into a single Table keyed by sheet name. Each sheet's value is shaped by the Layout param (Dense or Sparse), same semantics as Spreadsheet.Read.

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