Osprey: Modern functional programming oriented language designed for elegance

That's less concerning than the available built-in types:

    Int: 64-bit signed integers
    String: UTF-8 encoded strings
    Bool: Boolean values (true, false)
    Unit: Type for functions that don’t return a meaningful value
    Result<T, E>: Built-in generic type for error handling

How does one to anything other than 64-bit integer math?