anchor.diff:  translate_posting_filter(undefined) ->
       undefined;
   translate_posting_filter(#'PostingFilter'{sort_by = 'RELEVANCE',
  -					  start_ts = 0,
  -					  end_ts = 0,
  +					  start_ts = <<>>,
  +					  end_ts = <<>>,
   					  max_postings = 0}) ->
       undefined;
   translate_posting_filter(#'PostingFilter'{sort_by = SortBy,
  
positive.code: 						  threshold = Threshold,
  						  set_value = SetValue}) ->
      {increment,
       binary:decode_unsigned(Threshold, big),
       binary:decode_unsigned(SetValue, big)};
  translate_update_instruction(#'UpdateInstruction'{instruction = 'OVERWRITE'}) ->
      overwrite.
  
  
negative.code:     {null, <<>>};
  make_value(A) when is_atom(A) ->
      {string, atom_to_list(A)};
  make_value(A) when is_map(A) ->
      make_value(maps:to_list(A));
  make_value(T) when is_tuple(T) ->
      {binary, term_to_binary(T)}.
  
  