> The document character order is different to the visual character display order (another complete accessiblity failure, but just about usable if crippled in use)
Word does that on occasion (or used to - haven't looked at the latest versions). Another PDF sin is specifying the exact x,y position of every single character even when the default font metrics are being used so there is no need. (The result is that approx 15 bytes are needed per character when one would do).