FasterCSV: Check wether a file is invalid before accepting it - is there a simpler way?

This is my current solution. I'm really interested in knowing improvements / alternatives.

I made some tests yesterday and it turns out that my solution didn't quite work; I kept getting empty arrays on valid CSVs after implementing the first is_valid . I'm not sure whether it's a FasterCSV caching issue or something in my code, and I don't know if it's related with my test setup, but I decided to go implement a safe_parse instead.

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