This version comes with major changes on the technical level and hardly visible to the user. Among those low-level changes are internal handling of geometry object (rectangle, points and friends) and name changes to standard PDF objects, like PDF_NAME_Rect has been renamed to PDF_NAME(Rect).
But there are notable functionality enhancements as well:
- updating an encrypted PDF lets you optionally keep encryption
- MuPDF messages going to STDOUT and STDERR are now intercepted and will no longer appear
- several new annotation types are officially supported by MuPDF
- a new geometry object
Quadsupports rectangles that are no longer axis-aligned. This allows addressing location of "tilted" text (i.e. which is neither horizontal nor vertical)
As always, a number of issues has been fixed as well.