Update README

Author: prozolic

README.md

@@ -78,11 +78,12 @@ public abstract record IpAddr : ISpanFormattable, ISpanParsable<IpAddr>
     public static bool TryParse([NotNullWhen(true)] string? s, IFormatProvider? provider, [MaybeNullWhen(false)] out IpAddr result);
 
     public static int Count { get; } => 3;
-    public static string? GetName(IpAddr t); 
+    public static string? GetName(IpAddr ipaddr); 
     public static string[] GetNames() => [nameof(V4), nameof(V6), nameof(None)];
-    public static byte GetNumericValue(IpAddr t);
-    public static IpAddrVariant ConvertEnum(IpAddr t);
-    public static bool TryConvertEnum([NotNullWhen(true)] IpAddr? t, [MaybeNullWhen(false)] out IpAddrVariant result);
+    public static ReadOnlySpan<byte> GetUtf8Name(IpAddr ipaddr);
+    public static byte GetNumericValue(IpAddr ipaddr);
+    public static IpAddrVariant ConvertEnum(IpAddr ipaddr);
+    public static bool TryConvertEnum([NotNullWhen(true)] IpAddr? ipaddr, [MaybeNullWhen(false)] out IpAddrVariant result);
     public static IpAddr Parse(ReadOnlySpan<char> s, bool ignoreCase, IFormatProvider? provider = default);
     public static bool TryParse(ReadOnlySpan<char> s, out IpAddr result);
     public static bool TryParse(ReadOnlySpan<char> s, bool ignoreCase, IFormatProvider? provider, [MaybeNullWhen(false)] out IpAddr result);
@@ -94,7 +95,6 @@ public abstract record IpAddr : ISpanFormattable, ISpanParsable<IpAddr>
 <details><summary>Generated All Code(IpAddr.g.cs)</summary>
 
 ```csharp
-
 // <auto-generated> This .cs file is generated by VariantEnum. </auto-generated>
 #nullable enable
 #pragma warning disable CS0219 // The variable 'variable' is assigned but its value is never used
@@ -268,6 +268,18 @@ public abstract record IpAddr :
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static string[] GetNames() => [nameof(V4), nameof(V6), nameof(None)];
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static ReadOnlySpan<byte> GetUtf8Name(IpAddr ipaddr)
+    {
+        return ipaddr switch
+        {
+            V4 => "V4"u8,
+            V6 => "V6"u8,
+            None => "None"u8,
+            _ => []
+        };
+    }
+
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static byte GetNumericValue(IpAddr ipaddr)
     {
@@ -351,7 +363,7 @@ public abstract record IpAddr :
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static bool TryParse(ReadOnlySpan<char> s, IFormatProvider? provider, [MaybeNullWhen(false)] out IpAddr result)
     {
-        return TryParse(s, false, null, out result);
+        return TryParse(s, false, provider, out result);
     }
 
     public static bool TryParse(ReadOnlySpan<char> s, bool ignoreCase, IFormatProvider? provider, [MaybeNullWhen(false)] out IpAddr result)
@@ -495,6 +507,13 @@ foreach (var name in names)
 // None
 ```
 
+### GetUtf8Name
+
+```csharp
+var utf8Name = IpAddr.GetUtf8Name(new IpAddr.V4(127, 0, 0, 1));
+Console.WriteLine(Encoding.UTF8.GetString(utf8Name)); // V4
+```
+
 ### IsDefined
 
 ```csharp