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Excerpts from Spencer Parkin's message of 2014-04-30 07:10:33 +0200:
> Thanks for the replies.  I'm curious...  how does the algorithm work?  How
> can Lua determine what does and doesn't need to be collected if it doesn't
> keep a reference count on an object?

https://en.wikipedia.org/wiki/Garbage_collection_(computer_science)#Tri-color_marking