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Jesse Jackson authored
The [spec](https://tools.ietf.org/html/rfc2119) states that these keywords are aliased to each other (in order to alleviate issues arising from the misinterpretation of using "shall"). Consistency helps readers (especially new/unfamiliar ones).
👀 References: - https://www.faa.gov/about/initiatives/plain_language/articles/mandatory/ - https://ell.stackexchange.com/a/171990/2487
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