Also remember that these are not fonts supplied by Kobo. Over the years, I've found quite a few fonts that do not work well on ereaders. For Kobo ereaders, most of those fonts did not work well with either the RMSDK renderer or the webkit based renderers. In this case, I suspect the use of RTL languages pretty much manadates the use of the webkit based renderer (better ePub3 support).
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