Typecasting causing struct values to change (Swift) - swift

Question

After downcasting an array of structs, my Variables View window shows that all of the values in my struct have shifted "down" (will explain in a second). But when I print(structName), the values are fine. However, when I run an equality check on the struct, it once again behaves as though my values have shifted.
For example, I am trying to downcast Model A to ModelProtocol. var m = Model A and has the values {id: "1234", name: "Cal"}. When I downcast, m now has the values { id:"\0\0", name:"1234" }.
Actual Example Below:
Models that I want to downcast:
struct PrivateSchoolModel: Decodable, SchoolProtocol {
var id: String
var name: String
var city: String
var state: String
}
struct PublicSchoolModel: Decodable, SchoolProtocol {
var id: String
var name: String
var city: String
var state: String
var latitude: String
var longitude: String
}
Protocol I want to downcast to:
protocol SchoolProtocol {
var id: String { get set }
var name: String { get set }
var city: String { get set }
var state: String { get set }
var longitude: Float { get set }
var latitude: Float { get set }
}
extension SchoolProtocol {
var longitude: Float {
get { return -1.0 }
set {}
}
var latitude: Float {
get { return -1.0 }
set {}
}
}
Downcasting:
guard let downcastedArr = privateSchoolArray as? [SchoolProtocol] else { return [] }
Result (item at index 0) or originalArr:
id = "1234"
name = "Leo High School"
city = "Bellview"
state = "WA"
Result (item at index 0) of downcastedArr:
id = "\0\0"
name = "1234"
city = "Leo High School"
state = "Bellview"
But if I print(downcastArr[0]), it will show:
id = "1234"
name = "Leo High School"
city = "Bellview"
state = "WA"
But if I try originalArray[0].id == downcastArr[0].id, it returns false
My Code with the problem:
class SchoolJSONHandler {
private enum JSONFile: String {
case publicSchool = "publicSchool"
case privateSchool = "privateSchool"
}
private lazy var privateSchoolArray = getPrivateSchools()
private lazy var publicSchoolArray = getPublicSchools()
func getSchoolArray(sorted: Bool, filtered: Bool, by stateAbbreviation: String?) -> [SchoolProtocol] {
var schools = combineArrays()
if sorted {
schools.sort(by: { $0.name < $1.name })
}
if filtered {
guard let abbr = stateAbbreviation else { return [] }
schools = schools.filter {
return $0.state == abbr
}
}
return schools
}
private func combineArrays() -> [SchoolProtocol] {
// EVERYTHING IS FINE IN NEXT LINE
let a = privateSchoolArray
// PROBLEM OCCURS IN NEXT 2 LINES WHEN DOWNCASTING
let b = privateSchoolArray as [SchoolProtocol]
let c = publicSchoolArray as [SchoolProtocol]
return b + c
}
private func getPublicSchools() -> [PublicSchoolModel] {
guard let jsonData = getJSONData(from: .publicSchool) else { return [] }
guard let schools = decode(jsonData: jsonData, using: [PublicSchoolModel].self) else { return [] }
return schools
}
private func getPrivateSchools() -> [PrivateSchoolModel] {
guard let jsonData = getJSONData(from: .privateSchool) else { return [] }
guard let schools = decode(jsonData: jsonData, using: [PrivateSchoolModel].self) else { return [] }
return schools
}
private func getJSONData(from resource: JSONFile) -> Data? {
let url = Bundle.main.url(forResource: resource.rawValue, withExtension: "json")!
do {
let jsonData = try Data(contentsOf: url)
return jsonData
}
catch {
print(error)
}
return nil
}
private func decode<M: Decodable>(jsonData: Data, using modelType: M.Type) -> M? {
do {
//here dataResponse received from a network request
let decoder = JSONDecoder()
let model = try decoder.decode(modelType, from:
jsonData) //Decode JSON Response Data
return model
} catch let parsingError {
print("Error", parsingError)
}
return nil
}
}
And then it is just called in another class by schoolJSONHandler.getSchoolArray(sorted: true, filtered: true, by: "WA")