Unexpected behaviour: the reverse of a link can be added to the graph

[vepain]

As it is not possible to add twice the same link line in the graph, one should expect to not be able to add the reversed link to the graph.

import gfapy

graph = gfapy.Gfa.from_file("graph.gfa")

for seg in graph.segments:
    for r_link_line in seg.dovetails_R:
        print(r_link_line)
        rev_r_link_line = f"L\t{r_link_line.to_segment.name}\t{gfapy.invert(r_link_line.to_orient)}\t{r_link_line.from_segment.name}\t{gfapy.invert(r_link_line.from_orient)}\t{r_link_line.overlap}"
        print(rev_r_link_line)
        graph.add_line(rev_r_link_line)  # should raise gfapy.RuntimeError exception
        # graph.add_line(r_link_line)   # this raises gfapy.RuntimeError exception
        print()

I suspect the same unexpected behaviour for edges in gfav2