columnDefs.sortable is not described on the options page
columnDefs.sortable is not described on the options page

columnsDef.sortable
is used in the Index Column example but not mentioned in the Options Reference.
I was initially confused b/c I thought it caused the index column to remain static. After reading the full example I realized there was some extra JS creating the effect.
It seems to be the same as columnsDef.orderable
?
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