likelihood of commenting out last N lines >> .. first N lines
What happens is I want to comment out a join entirely, and all its columns. I rarely find myself commenting out the first column. I'd prefer trailing commas on every element, where allowed, to be sure! but leading isn't so bad once I got used to it.
Plus to scan for a missing leading comma is a linear (literally!) search whereas [missing] trailing commas don't line up.
