pub fn decode_with_custom_header<F: FnOnce(u16) -> usize + 'static>(
) -> Result<Vec<u8>, Error>
englishid that was previously encoded using
encode_with_custom_header(). After parsing the embedded header,
callback is invoked with the value. The callback is responsible for
returning the number of bytes the result is expected to contain.
Error::UnknownWord: An unrecognized word was encountered.