By: Tom Sydney Kerckhove <syd@cs-syd.eu>
Define each VAT rate exactly once The standard rate was written down four times: as 0.081 in vatRateRatio, as 8.1 in the Stripe importer's setting default, as "8.1 %" in the Typst formatter, and as "8.1" in the E-MWST declaration, where a TODO already asked for this. The literal is now the only definition, in the form the law and the declaration state it in, and the ratio and the number are derived from it exactly and without failing. The Typst string and the declaration's literal come out byte-identical, which the unchanged golden output is the evidence for.