RouteBundleChain
Private bundle machinery returned by c.Route(port_list, port_list).
RouteBundleChain(cell_builder, ports_a, ports_b, routes: 'list[RouteChain]', spacing: 'float', radius: 'float', bend, p, profile, style, clearance: 'float', transition_offset: 'float', transitions, fanout: 'str' = 'U', target_length=None, start_straight: 'float' = 0.0, end_straight: 'float' = 0.0)