docs: final int internalEdgeAdd(int newEdgeId, int nodeA, int nodeB) {
          writeEdge(newEdgeId, nodeA, nodeB, EdgeIterator.NO_EDGE, EdgeIterator.NO_EDGE);
          long edgePointer = toPointer(newEdgeId);
  
          int edge = getEdgeRef(nodeA);
          if (edge > EdgeIterator.NO_EDGE)
              edges.setInt(E_LINKA + edgePointer, edge);
          setEdgeRef(nodeA, newEdgeId);
  
          if (nodeA != nodeB) {
              edge = getEdgeRef(nodeB);
              if (edge > EdgeIterator.NO_EDGE)
                  edges.setInt(E_LINKB + edgePointer, edge);
              setEdgeRef(nodeB, newEdgeId);
          }
          return newEdgeId;
      }