Constructs a monetary amount from an exact fee and currency.
amount accepts a Fee value object or a DecimalInput. currency
uses the same validated asset-string contract as instrument assets.
Throws ParamError on an invalid fee or AssetError on an invalid
currency.
ReadonlyamountThe exact fee amount.
ReadonlycurrencyThe currency identifier.
Returns a fresh monetary amount holding the same amount and currency.
Returns true when both the amount and currency are equal.
Exact fee amount paired with its validated currency.