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If this is a text-type custom column then use #colkey:=true and #colkey:=false to avoid having true and false be treated as reserved words with special meaning.
If it is a yes/no column then use #colkey:yes for the green check, #colkey:no for for the red X, and #colkey:empty for not set. As the documentation says (and is the same for all other columns), #colkey:true will find all cells that have any value (set) and #colkey:false will find cells that have no value at all (unset).
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