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in thread: http://lua-users.org/lists/lua-l/2005-08/msg00040.html
>Line 534 marks open upvals, which effectively marks the object in the upval. However, the marks are not propagated, and then the gray list is wiped out at line 536. (The explanation for remarkupvals is in Roberto's very useful presentation on Lua's internals.)


The explanation for remarkupvals is in Roberto's very useful
presentation on Lua's internals.

so I want to find the Roberto's presentation on Lua's internals. Can
anyone provide a link for this presentation?