value equal to: 'first', 'last' | boolean | list with values of type: boolean If true, the user can clear the column by clicking on the `clear` action button on the column. If there are multiple header rows, true will display the action button on each row. If `last`, the `clear` action button will only appear on the last header row. If `first` it will only appear on the first header row. These are respectively shortcut equivalents to `[false, ..., false, true]` and `[true, false, ..., false]`. If there are merged, multi-header columns then you can choose which column header row to display the `clear` action button in by supplying an array of booleans. For example, `[true, false]` will display the `clear` action button on the first row, but not the second row. If the `clear` action button appears on a merged column, then clicking on that button will clear *all* of the merged columns associated with it. Unlike `column.deletable`, this action does not remove the column(s) from the table. It only removed the associated entries from `data`.
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