There would be an actual miscalculation, yes. which is a really annoying kind of bug, also because these jit bugs tend to go away if you turn the debugger on, m

There would be an actual miscalculation, yes. which is a really annoying kind of bug, also because these jit bugs tend to go away if you turn the debugger on, making them even more frustrating to track down. The ones we found so far are all extremely unlikely to occur in 'regular' Python code, because they require the use of internal pypy specific numerical operations.