[Dev-luatex] unique node id?

Hi, is there a unique "node id" which I could use for example as a key in a table? Using the node directly somehow doesn't work. I am thinking of something like n = node.new("glyph") n.unique_id Something similar like this would suffice: print( tostring({}) ) table: 0x100106da0 this id doesn't change for that table. Is the following 172 something like I need? How would I access that (besides string.gsub())? nil : hlist 2> Patrick