Suprisingly, testing tools build on Test::Builder is not easy.
Test-Simple version: 1.001014 1000000_oks.t 38.51s user 0.44s system 100% cpu 38.941 total 1000000_oks.t 38.52s user 0.52s system 100% cpu 39.024 total 1000000_oks.t 38.92s user 0.35s system 100% cpu 39.254 total
Test-Stream version: 1.302024 1000000_oks.t 22.55s user 0.20s system 100% cpu 22.743 total 1000000_oks.t 22.71s user 0.18s system 100% cpu 22.882 total 1000000_oks.t 22.83s user 0.23s system 100% cpu 23.055 total
Test-Simple version: 1.302012_003 1000000_oks.t 34.11s user 0.43s system 100% cpu 34.525 total 1000000_oks.t 34.12s user 0.46s system 100% cpu 34.566 total 1000000_oks.t 34.45s user 0.40s system 100% cpu 34.841 total