Lua 5.2 alpha lua_setuservalue() question

[Benoit Germain <bnt.germain@...>]

Hello,

I was just wondering: is there any special reason why
lua_setuservalue() will only accept either a table or nil (according
to the manual)? I happen to have a binding where some full userdata
object of some type A is the hierarchical parent of other full
userdata objects of another type B. Given some object of type B, I
would like to be able to retrieve its parent of type A. The most
convenient way to do this is to store it in the user value. But since
I don't need anything else, I'd rather avoid to create a user value
table for each of those B objects.

-- 
Benoit.