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I use Vec3 and Quat types from the stack.  My Lua/C++ bindings take
and return tables.  I do this because many libraries dealing with
graphics (OpenGL etc.) take tables as arguments and I want to be able
to pass a Vec3 into functions like gl.Vertex() without a conversion
from a udata.  Here's a typical function:

Tables have the same problem as userdata, since they are dynamically allocated. Well, they are a little nicer to the garbage collector since they can't have __gc metamethods... but I have already patched Lua to address that problem :)

// Niklas