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pub trait DerivationCode {
    /// hard (fixed) part of code size in chars
    fn hard_size(&self) -> usize;
    /// soft (variable) part of code size in chars
    fn soft_size(&self) -> usize;
    /// value size in chars
    fn value_size(&self) -> usize;

    fn code_size(&self) -> usize {
        self.hard_size() + self.soft_size()
    }
    /// full size in chars of code prefixed to data
    fn full_size(&self) -> usize {
        self.code_size() + self.value_size()
    }
    fn to_str(&self) -> String;
}