//! Exchange rates between currencies, and tables of them.
//!//! No rates are built in, because rates change constantly. [`ExchangeRate`]
//! holds a rate you supply, and [`Exchange`] holds a set of them to look up
//! by currency pair.
modrate;modtable;pubuserate::{
ConvertError, CrossRateError, ExchangeRate, ExchangeRateError, InvertError, Pair,
ParsePairError, Side,};pubusetable::{Exchange, ExchangeError, IntoRates, Pairs, Rates};