By: Tom Sydney Kerckhove <syd@cs-syd.eu>
Keep the seed test away from the tests that re-seed The generator it is about is a global one, and every test that runs a nested forest re-seeds it. This branch adds several of those, so one landing between its two runs is now likely rather than theoretical, and that is a draw that does not match. Sequential is what sydtest has for a test that cannot share the suite, and the nested runs are what it cannot share it with.