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On 19/08/16 15:54, ThePhD wrote:
> I'm not sure if I want to ignore the metatable's index method, though
> (on the account of certain things masquerading like tables, such as
> certain kinds of userdata). 


It has been a while since I properly looked at the Lua source, so
somebody correct me if I am wrong, yet I do not think it is valid to use
lua_next on a userdata. From a quick look at the 5.1 source it would
seem this is correct at least for this version[1] as when api checks are
enabled it will by default assert due to the ttistable check.