Nullability of type of parameter 'value' doesn't match overridden member (possibly because of nullability attributes).

Nullability of reference types in value of type '(string? value, IConfigurationProvider provider)' doesn't match target type '(string Value, IConfigurationProvider? Provider)'.

Argument of type 'Dictionary<string, string>' cannot be used for parameter 'initialData' of type 'IEnumerable<KeyValuePair<string, string?>>' in 'IConfigurationBuilder MemoryConfigurationBuilderExtensions.AddInMemoryCollection(IConfigurationBuilder configurationBuilder, IEnumerable<KeyValuePair<string, string?>>? initialData)' due to differences in the nullability of reference types.

Non-nullable property 'Bar' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Argument of type 'Dictionary<string, string>' cannot be used for parameter 'initialData' of type 'IEnumerable<KeyValuePair<string, string?>>' in 'IConfigurationBuilder MemoryConfigurationBuilderExtensions.AddInMemoryCollection(IConfigurationBuilder configurationBuilder, IEnumerable<KeyValuePair<string, string?>>? initialData)' due to differences in the nullability of reference types.

Argument of type 'Dictionary<string, string>' cannot be used for parameter 'initialData' of type 'IEnumerable<KeyValuePair<string, string?>>' in 'IConfigurationBuilder MemoryConfigurationBuilderExtensions.AddInMemoryCollection(IConfigurationBuilder configurationBuilder, IEnumerable<KeyValuePair<string, string?>>? initialData)' due to differences in the nullability of reference types.

Non-nullable property 'Field' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Nested1' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Nested2' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.