### Bug report The Column.Exportable option is not correctly serialized and cannot be used to export hidden columns. ### Reproduction of the problem 1. Set Column.Exportable(true) and Column.Hidden(true). 2. Export the grid and see that the column is not present in the exported file. ### TicketID: 1543405 ### Environment * **Kendo UI version:** 2021.3.1109 * **jQuery version:** 1.12.4 * **Browser:** [all]