it does work if you load compiled hypervisor

assets/disk0/home/hdk/free.js

@@ -0,0 +1,14 @@
+if (exec_args[1] === undefined) {
+    println("Usage: free ptr_in_hex")
+    println("   This will free the pointer loaded using 'load'")
+    return 1
+}
+
+// check for CUM header
+const ptr = parseInt(exec_args[1], 16)
+const magic = sys.peek(ptr)
+
+if (magic != 0xA5) return 1
+
+
+sys.free(ptr)