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> As the author notes: the typing system is very pleasant. And the standard library is great!

The author complained about the standard library, specifically the Dir module using inconsistent types and the implementation details of Temp files potentially leading to security flaws, leading me to think there are more warts he didn't cover.

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Temp file issue is debunked here: https://news.ycombinator.com/item?id=41684848

Dir module works fine, though maybe the docs could be improved. https://crystal-lang.org/api/1.13.3/Dir.html . The stdlib code is also highly readable: https://github.com/crystal-lang/crystal/blob/d14d04562/src/d... shows that #each_child just calls #read and yields it to the block, so I don't think this is really a wart :)

I think the Dir issue wasn't that documentation was inadequate or stdlib code was hard to read, but he expected paths, and received strings instead.

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