Hello, newbie here.
I'm following an old tutorial and in order to delete closed/un-closed primitives the guy created an attribute called "closed" which is then referenced in a delete node. He uses $CLOSED in the delete node but when I do the same it shows it as an error. Is this a deprecated way of calling the attribute? I tried @CLOSED instead and that seamed to work but I have troubles further down the line and I'm trying to figure out if this makes a difference.