This is a nasty bug, because 250 MB+ files are certainly useful - printing 24x36 inches or larger would be a good example. Assuming you're planning to work on the image in Photoshop and print it from PS, does anyone know how Aperture's upsize quality compares to Photoshop's? If Photoshop handles the upsize better anyway, there's no loss in sending the file to Photoshop at native size, then using Bicubic Smoother (unless you have a file so large (50 mp Hasselblad?) that Aperture won't export it at native size). If Aperture has a more sophisticated upsize than Photoshop, then the bug becomes more significant, because you might want to send Photoshop the file at print size. From what I can determine from Apple's online info, Aperture's resizing is fairly unsophisticated unless you use a third-party plugin, so you'd probably want to resize in Photoshop later. Any plugin that works with Aperture should also have a Photoshop version, so plugin resizing is not a real issue.
As far as I can see, there are three cases where this becomes a real issue.
1.) Files that are natively too big for Aperture (39 MP digital back files are close, 50 MP are too big, many scans are too big).
2.) Files that need to be resized, but won't be opened in Photoshop - a folder full of files that Aperture is batch-processing, where a resize is needed.
3.) Printing from Aperture - will Aperture let you print an oversize file? I'm sure Aperture's resizing algorithm is better than the average printer driver's!