Graph is not able to handle both IPv4 and IPv6 addresses

When creating a graph through BGP Link State, if the IGP is IS-IS and both IPv4 and IPv6 topology are advertised, the resulting Graph from the Link State route is not correct:

• Edges are duplicated: we got both IPv4 edges and IPv6 edges with a different edge-id while it should be the same edge i.e. it is the same link
• Only one of IPv4 or IPv6 router-id is stored in Vertex