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I think string interpolation will be a big help when it comes to validation. Currently, comparing two extracted variables is not supported and hopefully it will be a added in the future.
const a = mablInputs.variables.user.a;
const b = mablInputs.variables.user.b;
if (a !== b) throw new Error('meh...');
You can use anything in the condition (regex). But I do feel your pain.
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