anchor.diff:  Pair pair = d.readPair();
   ----
   
  -Requesting next pair with `readPair()` returns the following series value or a `null` once the series is completely read. The pair is a simple placeholder with `getTimestamp()` and `getValue()`.
  +Requesting next pair with `readPair()` returns the following series value or a `null` once the series is completely
  +read. The pair is a simple placeholder object with `getTimestamp()` and `getDoubleValue()` or `getLongValue()`.
   
   == Internals
   
  
positive.code: c.addValue(long, double);
  ----
  
  Adds new value to the time series. After the block is ready, remember to call
  
  [source, java]
  ----
  
negative.code: === Block size
  
  The compressed blocks are created with a 27 bit header (unlike in the original paper, which uses a 14 bit delta header). This allows to
  use up to one day block size using millisecond precision.
  
  == Contributing
  
  