This won't affect Python-built arches significantly; but will be useful for the future 'viaduct' functionality where generic routing graphs can be built on the C++ side; too. Signed-off-by: gatecat <gatecat@ds0.me>
Signed-off-by: gatecat <gatecat@ds0.me>
Signed-off-by: David Shah <davey1576@gmail.com>