Why does Clippy not suggest removing an Option::map call with an "identity"

[mandx]

Playing around with the following code, I accidentally left an map() call on the Option type (originally, the closure was dereferencing the parameter, or calling clone() on it, something like that). But I noticed that Clippy doesn't suggests that using map() like this is unnecessary:

fn fib(n: usize, memo: &mut [Option<usize>]) -> usize {
    memo[n].map(|v| v).unwrap_or_else(|| {
        let result = {
            if n > 1 {
                fib(n - 1, memo) + fib(n - 2, memo)
            } else {
                1
            }
        };
        memo[n] = Some(result);
        result
    })
}

fn main() {
    let number = 46;
    let mut memo: Vec<Option<usize>> = vec![None; number + 1];
    println!("{}", fib(number, &mut memo));
}

And if I turn on "pedantic" mode, the suggestion I get is to use map_or_else.

Play link

[camsteffen]

Today this lints as expected.