Hi Hans, this has been reported by Dohyun Kim [1]: the generic fontloader (not Context) serializes some tounicode values as Lua numbers, not strings. When re-reading the cache file the values lose all leading zeros, so they are no longer well-formed UTF-16BE.
...
["tounicode"]={
[2329]="E001",
...
[2384]="0063006B", -- <-- correct
[2385]=00630068, -- <-- invalid
[2386]=00740074,
[2387]=00630074,
[2388]="017F0069",
...
Best regards,
Philipp
[1] https://github.com/lualatex/luaotfload/issues/102
(Kim’s example works with luatex-plain if you comment out the
``\input luaotfload.sty`` line.)
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