I've been noticing that no-alcohol beers are given as 0.0% alcohol rather than just 0%. Perhaps it's to do with the way decimal places are used to show precision. If we've decided on no decimal places, then 0.4% would round down to 0%. I'm sure the made-for-kids shandy cans in the 70s were around 0,4%. By claiming 0.0%, you can be sure there's basically no alcohol present.
