That's the wrong model for the example. Some nasty surprises are derived from real world complexity. Imagine something like a timezone library. Also: >you sho

That's the wrong model for the example. Some nasty surprises are derived from real world complexity. Imagine something like a timezone library. Also: >you should fix them! OK, great! See you in 10 years when you've fixed everything and are ready to start implementing stakeholder requirements.