Copying a swift struct with a reference type property

Playground.swift

//: Playground - noun: a place where people can play

import UIKit

class Person: CustomDebugStringConvertible {
    let name: String
    init(name: String) {
        self.name = name
    }
    
    var debugDescription: String {
        get {
            return name
        }
    }
}

struct House {
    var owner: Person
    var address: String
}

let alice = Person(name: "Alice")

var house1 = House(owner: alice, address: "1")
house1.owner // Alice

var house2 = house1
house2.owner // Alice

house1.owner === house2.owner // true, same ref