Because of Windows Core, Windows 10 is a modular, lightweight operating system that can be deployed to various devices with a small storage footprint and memory requirement. 

An Update on the MSDN and TechNet Migration to docs.microsoft.com 

Work in progress to add support for covariant return types to the .NET runtime. Soon we'll be able to override a virtual method returning `object` with a method returning `string`. Because of how array variance works, weird things might be possible in IL. 

class Base
{
    public virtual IntPtr[] Fun() => null;
}

// This is obvious pseude-code because C# won't let us introduce methods differing
// in return type. C# also requires to be explicit about "virtual" and "override".
// But IL... not so much.
class Derived : Base
{
    // overrides Base.Fun on 32bit platforms.
    public override uint[] Fun() => null;

    // overrides Base.Fun on 64bit platforms.
    public override ulong[] Fun() => null;
}

Custom domains on GitHub Pages gain support for HTTPS  

These are the customer-reported issues addressed in 15.8.9:

• Added support for Xcode 10.1 in Visual Studio Tools for Xamarin.
• Updated the Xamarin.Forms template to Xamarin.Forms 3.3.0.
• Update 15.8.6 breaks Installer Projects.
• Internal Compiler error in VS15.8 msc1.cpp line 1518.
• Microsoft Visual Studio 2017 Installer Projects 0.8.8 and VS 15.8.6.
• SFINAE fails to detect matching overloaded function in preview VS preview 3 15.9.0.
• XAML Designer crash on Visual Studio close. 

"Going forward, we do not plan to evolve Visual Basic as a language," the .NET team said. "This supports language stability and maintains compatibility between the .NET Core and .NET Framework versions of Visual Basic. Future features of .NET Core that require language changes may not be supported in Visual Basic. Due to differences in the platform, there will be some differences between Visual Basic on .NET Framework and .NET Core."  

This library have been developed for today's standards, for a workflow careless about legacy browsers thanks to polyfill services and other available options to support legacy browsers.