pub struct DownloadInstanceInputOutputCallbacks {
    pub read: Option<Box<dyn FnMut(&mut [u8]) -> Option<isize>>>,
    pub write: Option<Box<dyn FnMut(&[u8]) -> usize>>,
    pub progress: Option<Box<dyn FnMut(u64, u64) -> bool>>,
}

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§read: Option<Box<dyn FnMut(&mut [u8]) -> Option<isize>>>§write: Option<Box<dyn FnMut(&[u8]) -> usize>>§progress: Option<Box<dyn FnMut(u64, u64) -> bool>>

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