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Hello, lua.

How to add custom per-thread data in Lua 5.2?

The only message I have found on this topic is:

Yes, I can setup a hash or put key/value pairs in the Registry.

But I need it to be very _fast_.

So, we have no per-thread fenv, no GLOBALS pseudo-index and
lua_replace trick for thread globals.

I would prefer to have something like light user-data which can be
obtained from lua state pointer.

With best regards,