recursing issue since forever, "separator" v.s. "terminator" both can work. For data rows, I prefer termination as makes missing columns explicit. But being op

recursing issue since forever, "separator" v.s. "terminator" both can work. For data rows, I prefer termination as makes missing columns explicit. But being optional here, it means nothing. I guess it facilitates low effort scripting that doesn't have to treat the last element differently.