Comparison

util.human.io: Pass nil to cell mapper to signal missing value Seems more like conventional Lua than passing an empty string to signal lack of value.

comparison

equal deleted inserted replaced

-:6a241e66eec5
+:e712133b4de1
 			titles, row = true, array.pluck(col_specs, "title", "");
 		end
 		local output = {};
 		for i, column in ipairs(col_specs) do
 			local width = widths[i];
-			local v = (not titles and column.mapper or tostring)(row[not titles and column.key or i] or "", row);
+			local v = row[not titles and column.key or i];
+			if not titles and column.mapper then
+				v = column.mapper(v, row);
+			end
+			if v == nil then
+				v = "";
+			else
+				v = tostring(v);
+			end
 			if #v < width then
 				if column.align == "right" then
 					v = padleft(v, width);
 				else
 					v = padright(v, width);