GimpUi.IntStore:user-data-type
"user-data-type" GType : Read / Write / Construct Only
Sets the GLib.Type for the GIMP_INT_STORE_USER_DATA column.
You need to set this property when constructing the store if you want to use the GIMP_INT_STORE_USER_DATA column and want to have the store handle ref-counting of your user data.
Since 2.4