Function `copy_bidirectional_with_sizes`

async fn copy_bidirectional_with_sizes<A, B>(a: &mut A, b: &mut B, a_to_b_buf_size: usize, b_to_a_buf_size: usize) -> Result<(u64, u64)>
where
    A: AsyncRead + AsyncWrite + Unpin + ?Sized,
    B: AsyncRead + AsyncWrite + Unpin + ?Sized

Copies data in both directions between a and b using buffers of the specified size.

This method is the same as the [copy_bidirectional()], except that it allows you to set the size of the internal buffers used when copying data.