message: remove truncate
diff: @@ -111,13 +111,13 @@ impl Term {
  /// Removes the value_bytes and set the field and type code.
  pub(crate) fn clear_with_field_and_type(&mut self, typ: Type, field: Field) {
  - self.truncate(TERM_METADATA_LENGTH);
  + self.truncate_value_bytes(0);
  self.set_field_and_type(field, typ);
  }
  /// Removes the value_bytes and set the type code.
  pub fn clear_with_type(&mut self, typ: Type) {
  - self.truncate(TERM_METADATA_LENGTH);
  + self.truncate_value_bytes(0);
  self.0[4] = typ.to_code();
  }
  @@ -157,7 +157,7 @@ impl Term {
  /// Sets the value of a `Bytes` field.
  pub fn set_bytes(&mut self, bytes: &[u8]) {
  - self.0.truncate(TERM_METADATA_LENGTH);
  + self.truncate_value_bytes(0);
  self.0.extend(bytes);
  }
  @@ -166,12 +166,6 @@ impl Term {
  self.set_bytes(text.as_bytes());
  }
  - /// Truncates the term. The new length needs to be at least 5, which is reserved for metadata.
  - fn truncate(&mut self, len: usize) {
  - assert!(len >= TERM_METADATA_LENGTH);
  - self.0.truncate(len);
  - }
  -
  /// Truncates the value bytes of the term. Value and field type stays the same.
  pub fn truncate_value_bytes(&mut self, len: usize) {
  self.0.truncate(len + TERM_METADATA_LENGTH);
  