Incorrectly parsing numbers as `Null` under Linux

Sample JSON

{
  "aggregations": {
    "my_aggregation": {
      "value": 9
    }
  }
}

Models

let int: Decoded<Int> = json <| ["aggregations", "device_count", "value"]
// ^ missingKey("value")

Argo Version

4.1.2

Dependency Manager

Swift Package Manager.

---

This only occurs under Linux. Locally, there's no problem on MacOS. Under the debugger it seemed to be showing that value was present but its value was null, as if {"value": null}.

Resolved this way (ugh).

let dict = json as? [String:Any]

let int = dict.flatMap({ d -> Any? in
    return d["aggregations"]
}).flatMap({  d -> [String:Any]? in
    return d as? [String:Any]
}).flatMap({ d -> Any? in
    return d["my_aggregation"]
}).flatMap({ d -> [String:Any]? in
   return d as? [String:Any]
}).flatMap({ d -> Any? in
    return d["value"]
}).flatMap({ d -> Int? in
   return d as? Int
})

I assume this is related to NSNumber being a shitshow on Linux, and thus isn't really Argo's problem. This issue is more for the benefit of everyone else.

(Related observation: if NSNumber's crufty addition of so many features is due to years of the "benefits" of ABI stability, I'm terrified for the consequences of Swift 5).