I worked (and I'm still working) on several big projects which wrote by different people, and by different companies, and at different time. I repeatedly notice

I worked (and I'm still working) on several big projects which wrote by different people, and by different companies, and at different time. I repeatedly noticed the same pattern where there is a limited linear array of contexts. For example, linear array of user contexts. In this case, it's easy to create a new object in that array just after previous object was destroyed at the same slot (we called an index number in the user context array - slot).