title: NewtonsoftJson being accepted in ASP.NET core 3.0 rc1 application
body: <p>This is more of a 'why is .NET okay with this?' kind of question. The documentation for migrating to 3.0 said to that NewtonsoftJson is no longer built into the shared framework. </p>
  
  <p>I have a couple libraries that are netstandard2.0 which use Newtonsoft.json package in which my 3.0 application is dependent. However, I am getting no complaints from my 3.0 application by just using <code>using Newtonsoft.Json</code> in the file. I don't have the recommended 3.0 Mvc.NewtonsoftJson package in the 3.0 project file either. </p>
  
  <p><a href="https://devblogs.microsoft.com/dotnet/try-the-new-system-text-json-apis/" rel="nofollow noreferrer">This article</a> mentions using the <code>System.Text.Json</code> NuGet package in .netstandard projects. Should I be doing this then?</p>