快速组合:如何指定tryMap(_:)的错误类型？

enum CustomError: Error {
    case someError
}

struct Person {
    let name: String
    let age: Int
}

func convertToPerson(from string: String) throws -> Person {
    let components = string.components(separatedBy: ",")
    guard components.count == 2 else {
        throw CustomError.someError
    }
    
    guard let age = Int(components[1]) else {
        throw CustomError.someError
    }
    
    return Person(name: components[0], age: age)
}

let data = ["John,25", "Jane,30", "InvalidData"]
let persons = try? data.tryMap(convertToPerson)

let persons = try? data.tryMap(convertToPerson) as [Person?]