Integer.class arrows not triggering attached hook

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I've got an integer gadget in my Reaction app; I've configured STRINGA_EditHook to look for changes etc. If I'm playing around in the actual editor box things work fine. However, clicking on the arrows doesn't trigger the hook even though the value is changing. Is this a bug with the integer.class?

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It is not a bug we are aware of, so we will have to take a look. The fear is that chaning it will break other programs.