I recall seeing - but I can't find them now - pictures of an ereader displaying Hebrew text. It looked correctly right justified, but I can't say if it was properly rendered. Hebrew is the only other right-to-left text I can think of. I realize that Arabic is a more complicated text form, but it is a step in the right direction.
Can anybody recall which reader was pictured?
By the way, the Unicode documents describe how to handle rtl languages, even mixed with ltr text, so it's not completely unmapped territory.
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