New JsonValue derived class for JSON primitives

src/libraries/System.Text.Json/src/System.Text.Json.csproj

@@ -88,6 +88,7 @@ The System.Text.Json library is built-in as part of the shared framework in .NET
     <Compile Include="System\Text\Json\Nodes\JsonValue.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonValueOfTCustomized.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonValueOfT.cs" />
+    <Compile Include="System\Text\Json\Nodes\JsonValueOfJsonPrimitive.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonValueOfTPrimitive.cs" />
     <Compile Include="System\Text\Json\Reader\ConsumeNumberResult.cs" />
     <Compile Include="System\Text\Json\Reader\ConsumeTokenResult.cs" />

src/libraries/System.Text.Json/src/System/Text/Json/Document/JsonDocument.cs

@@ -694,29 +694,7 @@ internal bool TryGetValue(int index, out Guid value)
             ReadOnlySpan<byte> data = _utf8Json.Span;
             ReadOnlySpan<byte> segment = data.Slice(row.Location, row.SizeOrLength);
 
-            if (segment.Length > JsonConstants.MaximumEscapedGuidLength)
-            {
-                value = default;
-                return false;
-            }
-
-            // Segment needs to be unescaped
-            if (row.HasComplexChildren)
-            {
-                return JsonReaderHelper.TryGetEscapedGuid(segment, out value);
-            }
-
-            Debug.Assert(segment.IndexOf(JsonConstants.BackSlash) == -1);
-
-            if (segment.Length == JsonConstants.MaximumFormatGuidLength
-                && Utf8Parser.TryParse(segment, out Guid tmp, out _, 'D'))
-            {
-                value = tmp;
-                return true;
-            }
-
-            value = default;
-            return false;
+            return JsonReaderHelper.TryGetValue(segment, row.HasComplexChildren, out value);
         }
 
         internal string GetRawValueAsString(int index)