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The Sigil forum seems to be home to many epub-producers at MobileRead. I think you'll have more luck finding someone with experience in such details there. I had to look up ZWNJ myself to see what it means, and it was far beyond a simple reader's ken (unless they happen to read Arabic, Farsi, Sinhalese,...). Good luck; it will be good when such things are treated properly by the majority of software.
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