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That reminds me of relying on static type inference so much that the code is hard to follow in Github and you need to pull it into your IDE just so you can keep track of the types as you read it.

While a filename extension could probably be superseded by file metadata, it's also nice when you can read the intention right in the name without additional tooling.

Especially when you consider a hypothetical world without filename extensions thus every UI shows the filetype next to the filename thus "readme.md" in our world is just "readme:md" in their world, and it's not obvious what was gained nor lost.



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