There should be away of preventing Highlight / HighlightIf from working when dumping to Grid. At present they just confuse the output (you read the 'raw' value for all the HighlightIf=false rows, but 'object' for all the HighlightIf=true rows)

If there were a 'DumpContext.Mode' then obviously that could be used as part of the HighlightIf predicate. But there isn't (that I know of). And it can't be query-wide because different parts of a query might be dumped differently (does have to be some kind of dump context).