code: public Result<SingleValue> readSingleValue(Series series, DateTime timestamp) {
      return readSingleValue(series, timestamp, DateTimeZone.getDefault(), Direction.EXACT);
    }
docs: Reads a single value for a series at a specific timestamp (exact match).
  <p>The returned value (datapoint) can be null if there are no
  datapoints in the series or in the specified direction. The system default
  timezone is used.
  
  @param series The series to read from
  @param timestamp The timestamp to read a value at
  @return The value at the specified timestamp
  
  @see SingleValue
  @since 1.1.0