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The std::views::all may seem a bit pointless, producing a view of all elements in a range.

However, std::views::all will produce different types based on the value category of the argument and whether it is a borrowed range, ensuring that we don't end up with a dangling view.

The resulting type can also be accessed through a helper std::views::all_t.

Compiler Explorer link: https://compiler-explorer.com/z/rx4jWK3fr