Method should_keep

crates/stdlib/src/posixsubprocess.rs:413–419

(self, fd: i32)

impl KeepFds<'_> {
    fn should_keep(self, fd: i32) -> bool {
        fd > self.above
            && self
                .keep
                .binary_search_by_key(&fd, BorrowedFd::as_raw_fd)
                .is_err()
    }
}

fn close_fds(keep: KeepFds<'_>) {