System.Runtime.Serialization.Json nuget package error

[rebulanyum]

Hello.

I've started to use .NetCore version=1.0.0-preview2-003121 with Visual Studio 2015. My project.json file is below:

{
 "version": "1.0.0-*",
 "frameworks": {
 "netstandard2.0": {
 "dependencies": {
 "System.Runtime.Serialization.Xml": "4.3.0",
 "System.Runtime.Serialization.Json": "4.3.0"
 }
 }
 }
}

My code file is below:

using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;

namespace NetCoreTests
{
 public class Class1
 {
 public Class1()
 {
 XmlObjectSerializer ser = new DataContractJsonSerializer(typeof(int));
 }
 }
}

And this is the error I get when I try to build the solution:

CS0029	Cannot implicitly convert type 'System.Runtime.Serialization.Json.DataContractJsonSerializer' to 'System.Runtime.Serialization.XmlObjectSerializer'	NetCoreTests..NETStandard,Version=v2.0

Looks like DataContractJsonSerializer class in System.Runtime.Serialization.Json nuget package doesn't inherit XmlObjectSerializer class in System.Runtime.Serialization.Xml nuget package. I can see that in general there's no dependency between these 2 nuget packages; however, if you check 4 and later versions of .Net Framework DataContractJsonSerializer always inherits from XmlObjectSerializer because as far as I know every DataContractSerializer inherits from XmlObjectSerializer. Even in this repository this inheritance exists:
https://github.com/dotnet/standard/blob/master/netstandard/ref/System.Runtime.Serialization.cs#L332

Can you please fix the nuget packages? Or what can you advice for me about this situation?

[rebulanyum]

https://stackoverflow.com/a/47292566/1266820

Maybe there is a bug with VS2015 tooling; but .NetStandard2.0 with VS2017 solves the issue. When I use VS2015 it fails again.