anchor.diff:      StartIncl = proplists:get_value(start_incl, Opts, true),
       EndIncl = proplists:get_value(end_incl, Opts, false),
       Continuation = proplists:get_value(continuation, Opts),
  +    Cover = proplists:get_value(cover_context, Opts),
   
       {T, B} = maybe_bucket_type(Bucket),
   
  
positive.code:          default_timeout/1,
           tunnel/4,
           get_preflist/3, get_preflist/4,
           get_coverage/2, get_coverage/3]).
  
  %% Counter API
  -export([counter_incr/4, counter_val/3]).
  
negative.code:                           end_incl=EndIncl,
                            max_results=MaxResults,
                            continuation=Continuation,
                            cover_context=Cover,
                            timeout=Timeout},
      ReqId = mk_reqid(),
      Call = {req, Req, Timeout, {ReqId, self()}},
  