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This file records noteworthy changes. (Public domain.)
+* Knuth 2021 tune-up, with fixes to all of his *.web files. Overview:
+https://tug.org/TUGboat/42-1/tb130knuth-tuneup21.pdf
+New TeX version is 3.141592653, MF 2.71828182.
+
* pdftex, xetex, e(u)ptex: if \tracinglostchars >= 3,
make missing characters an error (not just a log message),
and always report the character code in hex.