The input type action for the input box control has a **+ (add) ** operator. I don’t see a use for a plus or any operator. It’s not a number value or a text that can be appended.
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The reason for this is that actions and conditions that only use a number or a text are declared in one go (the action, the condition and the expression). Thus, they use standard parameters.
Here, I guess it’s not a big issue as = is the default operator.