Re-write CurrencyMint implementation for new Currency protocol #41
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Motivation:
CurrencyMint is a useful abstraction that allows creation of instances of Currency types dynamically, such as from API responses. The existing implementation doesn't correctly allow working with existential instances. There are also language features available in 5.7+ to better express things in the type system.
Modifications:
CurrencyMint
to work withany Currency
instead ofAnyCurrency
Currency
conforming types rather thanAnyCurrency
Result:
CurrencyMint
is more flexible in the type system and plays better with modern Swift language features.