.and_then(|limit| (limit <= MAX_LIMIT).then_some(limit)),
      rune: Rune(rune),
      symbol: fields
        .remove(&TAG_SYMBOL)
        .and_then(|symbol| u32::try_from(symbol).ok())
        .and_then(char::from_u32),
      term: fields
        .remove(&TAG_TERM)
        .and_then(|term| u32::try_from(term).ok()),
    });

    Ok(Some(Self {
      edicts: body,
      etching,
      burn: fields.keys().any(|tag| tag % 2 == 0),
    }))
  }

  #[cfg(test)]
  pub(crate) fn encipher(&self) -> ScriptBuf {
    let mut payload = Vec::new();

    if let Some(etching) = self.etching {
      varint::encode_to_vec(TAG_RUNE, &mut payload);
      varint::encode_to_vec(etching.rune.0, &mut payload);

      if etching.divisibility != 0 && etching.divisibility <= MAX_DIVISIBILITY {
        varint::encode_to_vec(TAG_DIVISIBILITY, &mut payload);
        varint::encode_to_vec(etching.divisibility.into(), &mut payload);
      }

      if let Some(symbol) = etching.symbol {
        varint::encode_to_vec(TAG_SYMBOL, &mut payload);