Prototype's "↩︎ Back" x Set Variable changes

A lot of us are using “Set variable” reduce the amount of screens used in prototypes, but the “Back” action does not roll back “Set variable” actions. This would be great for keypads or text fields, allowing to remove the last letter or number typed.

As we cannot use the modulo operator (%) and neither substrings and .length() there’s no workaround for this.

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