[Preview5] JsonSerializer cannot convert boolean to string

[ianjirka]

It converts to a string using newtonsoft. Workaround is easy, filing a bug as FYI.

System.Text.Json.JsonReaderException: The JSON value from [RecaptchaVerificationResponse].success could not be converted to System.String.
   at System.Text.Json.ThrowHelper.ThrowJsonReaderException_DeserializeUnableToConvertValue(Type propertyType, Utf8JsonReader& reader, ReadStack& state)
...

public class RecaptchaVerificationResponse
    {
        public string success {get;set;}
        public DateTime challenge_ts {get;set;}
        public string hostname {get;set;}
        [JsonProperty("error-codes")]
        public string[] error_codes {get;set;}
    }

{"success": true,"challenge_ts": "2019-05-17T02:23:27Z","hostname": "testkey.google.com"}

[ahsonkhan]

This is a known limitation of the JsonSerializer, by design. We generally avoid loose types/inferring what types could work between JSON and .NET types and only do "strict" matching.

We are working to provide an extension capability that will let callers write their own converters which is more flexible.

cc @steveharter, @JeremyKuhne

[ahsonkhan]

Also cc @JamesNK, @rynowak

[ianjirka]

Makes sense, thank you @ahsonkhan

[ahsonkhan]

The extension/converter feature is tracked by https://github.com/dotnet/corefx/issues/36639.

Closing as by-design.