1 files changed, 12 insertions, 5 deletions
diff --git a/tex/context/base/mkiv/luat-cbk.lua b/tex/context/base/mkiv/luat-cbk.lua
index 2c3bede72..6fcfdc7f2 100644
--- a/tex/context/base/mkiv/luat-cbk.lua
+++ b/tex/context/base/mkiv/luat-cbk.lua
@@ -70,19 +70,26 @@ directives.register("system.callbacks.permitoverloads", function(v)
     end
 end)
 
-sandbox.initializer(function()
-    block_overloads = true
-end)
+sandbox.initializer {
+    category = "functions",
+    action   = function()
+        block_overloads = true
+    end
+}
 
 if not list then -- otherwise counters get reset
 
     list = utilities.storage.allocate(list_callbacks())
 
+    local supported = { }
+
     for k in next, list do
-        list[k] = 0
+        list[k]      = 0
+        supported[k] = true
     end
 
-    callbacks.list = list
+    callbacks.list      = list
+    callbacks.supported = supported
 
 end