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Not really security, but regarding software in general, Mud is one of the reasons I gravitated torwards pure FP languages. It doesn't solve everything, but the added guarantees help shift some of the cognitive burden away from having to dig into every method to have to see what's going on, and I can spend that mental budget elsewhere.

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Maybe FP forces some degree of added conformity to the code. But I find code maintenance and readability has more to do with the person writing it than the tool they used IMHO.

FYI I am in fact an FP fan, and I use FP principles in a large amount of my code. But I've seen some seriously convoluted and confusing FP code just like I've seen behemoths of objects with twisted internal state manipulation balancing on blind assumptions and false guarantees of order.

This reminds me that "but think of the children" mantra. From my observation programmers often tend to justify / promote their languages/tools/etc under pretense of solving security problems.

"Not really security"

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