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Note that "nearly all" isn't "all". I have some side project that require rendering of very uncommon CJK characters, and Unifont does not display them as expected. (For that project, I used https://kamichikoichi.github.io/jigmo/ which was the font that was most complete in terms of CJK glyphs )

Unifont seems to have about the same glyph coverage as my system default CJK font (unfortunately I don't know what it is).

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Do you know if those characters are in supplemental planes? The BMP would only be glyphs from U+0000 through U+FFFF (though the first 32 and last two aren't printable, and wouldn't be included in this font).

Another example would be emoji, which would probably now be considered "basic" by most people but have always been in a supplemental plane.

Lots of the rarer CJK ideographs are outside the BMP.

This was actually the first issue for my kanji learning app

https://github.com/runarberg/shodoku/issues/1

A classic utf-16 bug, where I failed to grab the two remaining bytes of these ideographs.

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