Function encode_seq_into_slice_with_config 

pub fn encode_seq_into_slice_with_config<E: Encode, I: ExactSizeIterator<Item = E>, C: Config>(
    iter: I,
    dst: &mut [u8],
    config: C,
) -> Result<usize>

Encode an exact-size iterator into a pre-allocated byte slice with a custom configuration.

See encode_seq_into_slice for details and examples.