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Especially corrections. If something in these papers is wrong, the fastest way to improve them is to be told.
Open an issue on GitHub or write directly. Please say which paper and which section. Every numerical claim in the series is reproduced in the verification suite, so if a number is wrong the script that produced it is public and can be checked.
Each paper has its own DOI. A BibTeX file, along with CSV, JSON, and a plain APA reference list, is in the code repository.