def hash_to_wf(point)
      format('%s %s %s source=%s %s %s',
             *point_array(point)).squeeze(' ').strip
    rescue StandardError
      raise Wavefront::Exception::InvalidPoint
    end
def hash_to_wf(point)
      format('%s %s %s source=%s %s %s',
             *point_array(point)).squeeze(' ').strip
    rescue StandardError
      raise Wavefront::Exception::InvalidPoint
    end
Convert a validated point to a string conforming to
 https://community.wavefront.com/docs/DOC-1031.  No validation
 is done here.

 @param point [Hash] a hash describing a point. See #write() for
   the format.