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2010/10/17 E. Toernig <>:
> As both, "a" and "b", become unreachable, Lua is right to collect both
> of them.  And it will call the gc-method in reverse order of creation:
> if "b" was created before "a" (should be, as "a" needs "b") it will
> call "a.gc" and then "b.gc".
> If Lua calls "a.gc" before "b.gc" even if "a" was created earlier than
> "b" then it's a bug.

Thank you for the precision. Please note that I didn't say that this
is a bug, I just said that the utilisation of an env table for
userdata is not suitable to ensure a proper finalization order for the
objects and your remark actually confirms that.