[sldev] SL Database purge

[Jason Giglio]

Argent Stonecutter wrote:
> In a tree-walking collector, that doesn't happen, but on the other  
> hand loops can hang the collector indefinitely. The operations on the  
> SL database should prevent explicit loops from happening, but they're  
> also inferring references from the contents of some assets, such as  
> scripts, and database corruption can create the damndest structures.  
> So what do you do?

The tortoise and hare algorithm works extremely well for loop detection.

-Jason

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