>Does the latest version still support Android 4.4.2 (for possible inclusion in Tolino e-readers)?
Yes, Librera will support old devices as long as possible
>Is there an easy way to always prefer the "publisher’s settings" (like embedded fonts)?
Yes, just set use Document style (please see screenshot)
>There seems to be a small bug with complicated OTF font rules.
Yes, Librera use Mupdf engine for rendering, it's can't correctly display html like in specification. It's has only limited support of html.
You can compare mupdf 1.11 vs mupdf 1.19 in the latest build (beta.librera.mobi)
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