How to handle non-standard /Rect coordinates?

[mvantzet]

In the PDF Reference 1.7 document, all examples of /Rect specify 4 coordinates in this order: minX, minY, maxX, maxY. In other words: bottom left corner, top right corner.
Section 8.4.4 (Appearance Streams), algorithm 8.1 step 2, hints that this might be the standard order for the coordinates; I couldn't find it in the document anywhere searching for 'Rect'.

We have encountered PDFs that specify /Rect using maxX, minY, minX, maxY. In other words: bottom right, top left. The constructed PdfRectangle is then incorrect. In our case it ultimately leads to a bounding rectangle with correct height, but width 0.

I see these possibilities (the first two involve taking min/max values of x1/x2 and y1/y2 respectively):

• Sanitize the input before creating a PdfRectangle - requires checks and changes in approx 60 locations where the constructor is called
• Fixing the corners in the PdfRectangle constructor
• Throwing an exception

What would be the right approach?