GapiSheetsV4Model.NumberFormatSourcetype t = {_type : string;The type of the number format. When writing, this field must be set.
*)pattern : string;Pattern string used for formatting. If not set, a default pattern based on the user's locale will be used if necessary for the given type. See the [Date and Number Formats guide](https://developers.google.com/workspace/sheets/api/guides/formats) for more information about the supported patterns.
*)}