message: cast aspirate + dispense delay seconds to number
diff: @@ -125,12 +125,14 @@ const stepFieldHelperMap: { [StepFieldName]: StepFieldHelpers } = {
  },
  aspirate_delay_seconds: {
  maskValue: composeMaskers(maskToInteger, onlyPositiveNumbers, defaultTo(1)),
  + castValue: Number,
  },
  aspirate_delay_mmFromBottom: {
  castValue: Number,
  },
  dispense_delay_seconds: {
  maskValue: composeMaskers(maskToInteger, onlyPositiveNumbers, defaultTo(1)),
  + castValue: Number,
  },
  dispense_delay_mmFromBottom: {
  castValue: Number,
  