In fairness the question is open to interpretation. They don’t specify if they mean western or eastern Arabic numerals.

As schools in the west already teach western, the people responding could justifiably deduce that the question is referring to eastern.

The character is just an amazingly good hacker. They operate at speeds us mere mortals can’t comprehend /s

I’m in the exact same position as you and take the same approach. It’s a hill I’m getting a mildly stubbed toe on.

Good point. They are pretty cheap to construct. All in less than €400 per unit but will take a few hours each to build.