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Remark
Usage of the avl library (irr) showed up in pdfTeX when Hartmut added some functionality. It therefore
also ended up in being used in LuaTeX. The two files avl.c and avl.h come from pyavl and are in the
public domain:
license: this package, pyavl, is donated to the public domain
author : Richard McGraw
email : dasnar@fastmail.fm
In the pdfTeX/LuaTeX the files were just there but I could track them down to
https://github.com/pankajp/pyavl
where the dates indicate that nothing has changed in the meantime. In the copies used here I added the
information mentioned above. The files had some (experimental) code as well as optional testing on NULL
values. As I don't expect updates (the code has been okay for quite a while) I made the tests mandate
and removed the experimental code.
Hans Hagen
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