this can be checked on your own demo page - http://docs.handsontable.com/0.23.0/demo-dropdown.html . Notice that this is with “strict:true”.
in the column named “Bumper Color”, just type “z”. the cell will accept z - it will be shows in red color , but the cell value will still be “Z”.
This behavior is breaking our entire spreadsheet because of erroneous input. The correct behavior is simple: NO OTHER value other than the dropdown values should be allowed in a cell. you make the choice whether it should be null or default value or whatever, but what is happening now is clearly wrong behavior.