# Microsoft.Extensions.Configuration

``` diff
 namespace Microsoft.Extensions.Configuration {
     public static class ConfigurationBinder {
-        public static object? GetValue(this IConfiguration configuration, Type type, string key, object defaultValue);
+        public static object? GetValue(this IConfiguration configuration, Type type, string key, object? defaultValue);
     }
     public sealed class ConfigurationManager : IConfiguration, IConfigurationBuilder, IConfigurationRoot, IDisposable {
-        IList<IConfigurationSource> IConfigurationBuilder.Sources { get; }

+        public IList<IConfigurationSource> Sources { get; }
     }
 }
```

