A number format reference: an ECMA-376 built-in id (number) or a format code string. Built-ins are STORED as ids (Excel's own model) and resolved to codes at the render/classification boundary.
A number format reference: an ECMA-376 built-in id (number) or a format code string. Built-ins are STORED as ids (Excel's own model) and resolved to codes at the render/classification boundary.