.NET核心配置管理器在读取一个键中有冒号的字典时,会给出一个关于该值的奇怪错误消息,这是预期的吗?

以下程序:

using System;
using System.Collections.Generic;
using Microsoft.Extensions.Configuration;

namespace ConsoleApp3
{
    class Program
    {
        static void Main()
        {
            var builder = new ConfigurationBuilder();
            builder.AddJsonFile("appsettings.json");

            var configuration = builder.Build();
            var options = configuration.Get<Options>();
            foreach (var kvp in options.Values)
                Console.WriteLine($"{kvp.Key}: {kvp.Value}");
        }
    }

    internal class Options
    {
        public Dictionary<string, bool> Values { get; } = new Dictionary<string, bool>();
    }
}

当给这个的时候 appsettings.json 文件,运行完美:

{
    "Values": {
        "a": true,
        "b": false
    }
}

但是改变现状 本章内容:

{
    "Values": {
        "a:b": true,
        "b": false
    }
}

未处理的异常:System.InvalidOperationException异常:无法创建类型为“”的实例系统.布尔'因为它缺少公共的无参数构造函数。

   at Microsoft.Extensions.Configuration.ConfigurationBinder.CreateInstance(Type type)
   at Microsoft.Extensions.Configuration.ConfigurationBinder.BindInstance(Type type, Object instance, IConfiguration config, BinderOptions options)
   at Microsoft.Extensions.Configuration.ConfigurationBinder.BindDictionary(Object dictionary, Type dictionaryType, IConfiguration config, BinderOptions options)
   at Microsoft.Extensions.Configuration.ConfigurationBinder.BindInstance(Type type, Object instance, IConfiguration config, BinderOptions options)
   at Microsoft.Extensions.Configuration.ConfigurationBinder.BindProperty(PropertyInfo property, Object instance, IConfiguration config, BinderOptions options)
   at Microsoft.Extensions.Configuration.ConfigurationBinder.BindNonScalar(IConfiguration configuration, Object instance, BinderOptions options)
   at Microsoft.Extensions.Configuration.ConfigurationBinder.BindInstance(Type type, Object instance, IConfiguration config, BinderOptions options)
   at Microsoft.Extensions.Configuration.ConfigurationBinder.Get[T](IConfiguration configuration, Action`1 configureOptions)
   at ConsoleApp3.Program.Main() in D:\Dev\ConsoleApp3\ConsoleApp3\Program.cs:line 15

我做错什么了?请注意,在键中使用冒号是完全合法的json,但可能在appsettings.json文件不支持文件?