Comment by solid_fuel

The entire underlying system has been replaced. The test suite is written around the current fuzzy edges and past problem areas, not every single behavior of the existing platform.

"If you can't trust your test suite to catch a hardware floating point arithmetic bug, you shouldn't trust it at all."

"If you can't trust your test suite to catch a JVM bug, you shouldn't trust it at all."

"If you can't trust your test suite to catch a recurring memory error, you shouldn't trust it at all."