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Dec. 11, 2021
4:55 p.m.
The line of reasoning for the packaging tooling choosing TOML is elaborated upon in PEP 518 (https://www.python.org/dev/peps/pep-0518/#other-file-formats) and that choice was informed by a survey of the existing formats: https://gist.github.com/njsmith/78f68204c5d969f8c8bc645ef77d4a8f.