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Hi, I'm doing more with userdata and am just wondering, is it safe to push the address of a (full) userdata to keep a reference to it? And remove that reference in the userdata's __gc function?

Basically, I want to store within the C userdata itself, a reference to the Lua object version of it. This is so that even if I pass it through C code (without Lua), I can later get back the Lua version of it, for additional processing.

Or, is there a better way to turn the address of a (full) userdata, in C, back into its Lua object?