Make avaliable weak value until end of `__gc`

[alexeymelnichuck@...]

Hello.

I writing libuv binding and have problem with close C handle.
I have weak table that map C handles(lightuserdata) to Lua objects.
So when libuv gives me a handle I can find corresponding Lua object.
But because close handle is two-phase operation (call `uv_close` and
wait  callback)  I  need  to  store my pair (handle=>object) valid until
end of callback. In my `__gc` method I create reference in registry
because Lua already remove pair from weak table and call uv_close.
But  problem  is  that Lua can remove pair from weak table and did not
call `__gc` method. So there no way find out Lua object by C Handle.

```Lua
 -- create garbage handle that Lua have to collect
uv.timer()

-- here Lua may remove timer from weak table
-- but did not call `__gc`

--  libuv  has timer handle even if we call uv_close (because callback
-- is not called. So we still need map C handle to Lua object.
uv.walk(function(handle) ... end)
```

So   only   one   way  I  see is to create another one weak table with
weak  keys  (Lua  object => `true`) and use full scan on it when I can
not find Lua object in first one.

May be some one know better solution?



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