Various threads show these different syntaxes

• sortInfo: { field:'myField', direction:'asc'}
• sortInfo: { column:''myColumn', direction:'asc'}
• sortInfo: { column: {field:'myField}, direction:'asc'}
• sortInfo: ko.observable( ...... )

Questions

• Is the field/column value the column def field value or display name?
• is the descending value 'desc' or other?

I've tried various combinations and none default the sorted column. maybe a simple jsfiddle example