Spoke length - round up or down?

For a new wheel build I've used three different spoke length calculators to come up with figures of 285.6, 285.9 and 286 for the RHS and 283.3, 283.5 and 283.9 for the LHS. I'm using spokes that come in even numbers, 282, 284, 286 etc. Generally I'd round down to avoid bottoming out a spoke, but these figures are pretty close to the next highest number. Should I round down and go for 282 RHS and 284 LHS, or would I be safe rounding up by c.0.5mm to 284 LHS and 286 RHS?