Currently, if two nodes of a network-type graph are connected by multiple edges (or links), only the last of these links in the data series will be displayed, as it will appear on top of all others.

This is problematic in a case where a network graph should include multiple links of different styles, e.g. different colors, line styles, with different link labels, etc.

See example jsfiddle, where a solid teal and dotted red link are obscured by a solid red one :

https://jsfiddle.net/pqvemxsb/1/

Because all links are straight lines and their shape cannot be changed, it appears impossible to circumvent this issue.

For network graphs indicating different sorts of relationships between nodes, multiple link display would be an essential feature to add.