Cannot use Dns.GetHostAddresses from .NET Standard 1.6 Library

[watfordgnf]

Working on a fix for NATS, I used Dns.GetHostAddresses from the main library. The library is being built against .NET Standard 1.6.1, and I added the System.Net.NameResolution NuGet package to get this API. When trying to use it I receive the following build error:

1>Conn.cs(435,53,435,69): error CS0117: 'Dns' does not contain a definition for 'GetHostAddresses'

IntelliSense only suggests Dns.GetHostAddressesAsync.

I'm not sure why I can't use Dns.GetHostAddresses. Reviewing the .NET Standard 1.6 API it is clear it wasn't shipped, so I added the relevant NuGet package. The NuGet package states it supports at least .NET Standard 1.3. Looking at the code in question, I cannot find any evidence it excludes that method for .NET Standard.

[terrajobst]

The API definition for earlier versions of .NET Standard are fixed. In .NET Standard 1.3, the API surface of Dns was limited to this:

public static class Dns
{
	public static Task<IPAddress[]> GetHostAddressesAsync(string hostNameOrAddress);
	public static Task<IPHostEntry> GetHostEntryAsync(IPAddress address);
	public static Task<IPHostEntry> GetHostEntryAsync(string hostNameOrAddress);
	public static string GetHostName();
}

The rest came back in .NET Standard 2.0, which includes the Dns.GetHostAddresses method.