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One advantage to using the later Bookerly versions is that version 1.010 from the original post has 1866 glyphs while version 1.201 in the later releases has 2316 glyphs which helps prevent seeing an unknown charcter glyph while reading.
The replacement character glyph in Bookerly is the standard black diamond with a white question mark (�). Some renderers will use alternate glyphs such as the narrow rectangle, narrow rectangle with a ?, character value in hex in a box, etc. even if the font includes the replacement character glyph.
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