Optimization of object composition creation

Author: NikolayPianikov

src/Pure.DI.Core/Core/Code/RootBuilder.cs

@@ -86,6 +86,12 @@ private void BuildCode(CodeContext parentCtx)
             return;
         }
 
+        if (!string.IsNullOrEmpty(var.LocalFunctionName))
+        {
+            parentCtx.Lines.AppendLine($"{var.LocalFunctionName}();");
+            return;
+        }
+
         var lines = new LinesBuilder();
         var ctx = parentCtx with
         {

tests/Pure.DI.UsageTests/UseCases/JsonSerializationScenario.cs

@@ -112,7 +112,7 @@ private void Setup() =>
         DI.Setup(nameof(Composition))
             .Root<ISettingsService>(nameof(Settings))
             .Bind().To<SettingsService>()
-            .Bind().To(_ => new JsonSerializerOptions { WriteIndented = true })
+            .Bind().As(Singleton).To(_ => new JsonSerializerOptions { WriteIndented = true })
             .Bind(JSON).To<JsonSerializerOptions, Func<string, TT?>>(options => json => JsonSerializer.Deserialize<TT>(json, options))
             .Bind(JSON).To<JsonSerializerOptions, Func<TT, string>>(options => value => JsonSerializer.Serialize(value, options))
             .Bind().As(Singleton).To<Storage>();