code: public static Writable encodeBase64(Byte[] data, final boolean chunked) {
          return encodeBase64(DefaultTypeTransformation.convertToByteArray(data), chunked);
      }
docs: Produce a Writable object which writes the Base64 encoding of the byte array.
  Calling toString() on the result returns the encoding as a String. For more
  information on Base64 encoding and chunking see <code>RFC 4648</code>.
  
  @param data Byte array to be encoded
  @param chunked whether or not the Base64 encoded data should be MIME chunked
  @return object which will write the Base64 encoding of the byte array
  @since 1.5.1