[rossdavidh]

While I don't doubt that what you say is true, systems which, by spec, should be able to handle a given situation, that then years after they were written finally are called upon to handle that situation, fail more often than not.

The CEO also said they would pay $100million to clean up, which is not chump change, even for them I bet.

I'm not saying they were blameless, but I think most systems which have never had a given variable go negative, that years after they were written finally have that variable go negative, will have problems.

[futevolei]

Nat gas prices went negative pretty famously (in the biz) around 2010 or so. I give everyone a pass based on what you said until then. After that no free passes. IB screwed up.

[kungato]

They are not the first people on the planet to encounter edge cases. You either test thoroguhly enough for them or you don't.