Photoshop: Make (metric) measurements exact, without automatically adding/removing micrometers

I've been dealing with this problem ever since I've been using Photoshop, bot today is the day of reckoning I guess. I need my Photoshop to use these exact measurements. And I mean exactly, computer-precisely, these measurements: 283 millimeters by 195 millimeters. Photoshop flat out refuses these measurements, automatically changing them to 283,04 x 194,99 mm. Now it may not seem like much, but it's a big difference relatively speaking! Besides, we are working with computers here. I need exact measurements, not Photoshop's take on what a millimeter is or isn't.

Can this be fixed? Have I simply be doing something wrong all this time, or is this seriously the way Photoshop works? If so, can it be fixed?

Looking forward to any sort of reaction!