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I thought making as many checks as possibly static instead of dynamic generally made things faster, maybe it's worded backwards?

Static typing certainly makes things safer, which could be a good thing when talking about distributed systems with many communicating components.

It's also what makes it possible for you to write, say, a high-performance floating point matrix multiplication function and have the compiler emit code accepts floating point inputs without having to consider the possibility that the arguments were supplied as strings.

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