code: public byte[] toEncodedForm() {
      if (encodedForm == null) {
        encodedForm = new byte[encodedSize()];
        ArrayUtil.writeLong(encodedForm, 0, accessSchemaId);
        encode(encodedForm, new int[] { 8, encodedForm.length });
      }
      return encodedForm;
    }
docs: Turn an CompatibilityMap into its encoded form
  
  @return the encoded form as a byte array