Function isRowNumberColumnDef

isRowNumberColumnDef(o): o is RowNumberColumnDef
True for a RowNumberColumnDef – also from another copy of the core (no instanceof).
Parameters
- o: any
  the object to check, e.g. tableModel.getColumnDef(0)
Returns o is RowNumberColumnDef
true for a row number column
Example
```
const hasRowNumbers = isRowNumberColumnDef(tableModel.getColumnDef(0));
```
Since
1.1.93
- Defined in src/lib/table/instanceof-workaround.ts:81