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In 2014, Jake Smith wrote a 174-line code patch to solve a work migration issue, which unexpectedly gained nearly 20 million installs over twelve years. A recent bug was found that deletes the letter 'a' from paths, leading the author to advise stopping its use.
A blog post detailing how the author found a bug in Dummit and Foote's Abstract Algebra textbook while formalizing it in Rocq, specifically that a proposition about injective functions and left inverses is false for empty sets.