mechanism to insert Unicode characters by codepoint

[xworld21]

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I am trying to use \symbol{"XXXX} the way it is used in LuaTeX, that is, to pick a character by its Unicode codepoint. That does not work in LaTeXML because it goes through font maps that only cover parts of the 8-bit range.

I am not sure if there is a good answer, but e.g. if (e)TeX simply rejects values above 256 when calling \char and \symbol, then LaTeXML could emit straight Unicode characters when the argument is >=256.