Raised when Accrue.Money arithmetic is attempted across two different
currencies. Per D-04, cross-currency math never silently coerces or returns
a tagged tuple — it raises at the call site so the bug surfaces immediately.
Raised when Accrue.Money arithmetic is attempted across two different
currencies. Per D-04, cross-currency math never silently coerces or returns
a tagged tuple — it raises at the call site so the bug surfaces immediately.