I would have expected that if I have implemented From<T> for S then I get From<Vec<T>> for Vec<S> for free. However looking at the From Documentation I find nothing like this. I also cannot implement this myself, because both Vec and From are defined externally.

What is the recommended way to convert from Vec<i32> to Vec<i64>, say? In this Playground I wrote a custom from function to illustrate what I want to do. What's annoying is that this way I won't get into functions for free.

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