Using web interface creates swift Codable with type Int for 0.0 value

### Steps to reproduce:
1. Open https://app.quicktype.io/
2. Enter this JSON as the model:
```
{
"double_value": 0.0
}
```
3. Generated codable:
```
struct CustomModel: Codable {
let doubleValue: Int

enum CodingKeys: String, CodingKey {
case doubleValue = "double_value"
}
}
```

I would expect to get:
```
let doubleValue: Double
```
and it works correctly when value is different from `0.0`