What Programming Languages Are Used Most on Weekends? https://stackoverflow.blog/2017/02/What-Programming-Languages-Weekends/ (both Haskell and asm see more weekend use — both extremes!)
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Which Rust libraries are the most "business-y"? A fun analysis that compares weekday download rates with weekend downloads: https://old.reddit.com/r/rust/comments/nsvyxq/what_are_the_most_professional_crates/
checked_int_cast is used more on weekdays, whereas cpp_syn is used more at weekends. Not sure what to conclude there.