The library currently uses lots of floating-point math which leads to rounding errors, which is unacceptable for financial applications.

Here is some suggestions:

• Amount class should present asset amount as Decimal
• Price class should use Fraction for self["price"]
• Internal conversions in Price class (.invert() should not use floating-point math
• More general, all API objects exposed to library users should present prices as Fraction, and all amounts in Decimal
• Market.buy() and Market.sell() methods should be refactored to use Decimal for amounts and Fraction for price
• Add additional method to Market class to place an order with any amount of BASE and QUOTE, like place_raw_order(amount_to_sell: Amount, min_to_receive: Amount)