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> On Mar 24, 2017, at 10:26 AM, Coda Highland <> wrote:
> Well yes, of course, you make a weak-valued table with lightuserdata
> keys and full userdata values and marshal your pointers through that,
> but it's not immediately obvious and there are a number of possible
> pitfalls in the implementation (for example, forgetting that
> weak-valued tables are a thing makes this solution either ridiculously
> leaky or annoyingly difficult to maintain).
> This has come up a number of times before, so while I don't think that
> "per-value metatables" is the right solution to the task, it does at
> least indicate that the issue is fairly common.

I don’t think is a particularly complex design pattern, but I do agree it might be one that is worth documenting somewhere (in the wiki perhaps?). In any case the OP was suggesting a core design change in Lua as a solution when I think this pattern does all he needs.