computedCells

This row's formula cells — column id → current computed value — for cells that hold a formula ("=…") or belong to a column whose value is one. A formula cell derives its displayed value from the row's other cells and is not hand-editable; the value is CellFormulaError (renders "Error") when the formula is malformed, cyclic, or failed. Live-updated when a write into this row refreshes its formula cells. The model never holds the computed value.