Deserialize scientific notation to long with System.Text.Json

I have JSON with a number in scientific notation, e.g. 1.83E+2. Deserializing it with Json.NET to a long has worked well for me, but when I replace the deserializer with the new one in System.Text.Json it throws an JsonException:

System.Text.Json.JsonException: 'The JSON value could not be converted to System.Int64. ...'

Here is a reproducible example:

static void Main()
{
    // test1 is 183
    var test1 = Newtonsoft.Json.JsonConvert.DeserializeObject<Foo>(@"{""Bar"": 1.83E+2}"); 

    // throws JsonException
    var test2 = System.Text.Json.JsonSerializer.Deserialize<Foo>(@"{""Bar"": 1.83E+2}");
}

public class Foo
{
    public long Bar { get; set; }
}

After asking the .NET Core team they provided this solution to the problem:

static void Main()
{
    var options = new JsonSerializerOptions
    {
        Converters = { new CustomInt64Converter() }
    };

    // test1 is 183
    var test1 = Newtonsoft.Json.JsonConvert.DeserializeObject<Foo>(@"{""Bar"": 1.83E+2}");

    // test2 is 183
    var test2 = System.Text.Json.JsonSerializer.Deserialize<Foo>(@"{""Bar"": 1.83E+2}", options);
}

public class Foo
{
    public long Bar { get; set; }
}

public class CustomInt64Converter : JsonConverter<long>
{
    public override long Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        return reader.TryGetInt64(out var result) ? result : Convert.ToInt64(reader.GetDecimal());
    }

    public override void Write(Utf8JsonWriter writer, long value, JsonSerializerOptions options)
    {
        writer.WriteNumberValue(value);
    }
}