in src/node_template.rs [171:176]
fn deserialize_as_a_unit(bytes: &[u8], begin: &mut usize) -> Result<Self, DecodingError> {
if bytes.len() - *begin < 8 {
return Err(DecodingError::BytesNotEnough);
}
Ok(SumNodeSmt(bytes_to_usize(bytes, 8, begin).unwrap() as u64))
}