[Bug] JwtPayload no longer supports Guid claim values

[KevinH-MS]

Which version of Microsoft.IdentityModel are you using?
Microsoft.IdentityModel.Tokens 7.0.3

Where is the issue?

• M.IM.JsonWebTokens
• M.IM.KeyVaultExtensions
• M.IM.Logging
• M.IM.ManagedKeyVaultSecurityKey
• M.IM.Protocols
• M.IM.Protocols.OpenIdConnect
• M.IM.Protocols.SignedHttpRequest
• M.IM.Protocols.WsFederation
• M.IM.TestExtensions
• M.IM.Tokens
• M.IM.Tokens.Saml
• M.IM.Validators
• M.IM.Xml
• S.IM.Tokens.Jwt
• Other (please describe)

Is this a new or an existing app?
The app is in production and I have upgraded to a new version of Microsoft.IdentityModel.*

Repro

using System.IdentityModel.Tokens.Jwt;

var payload = new JwtPayload();
payload.Add("appid", Guid.NewGuid());

var jwt = payload.SerializeToJson();

Expected behavior

jwt == $"{{\"appid\":\"{guid}\"}}"

Actual behavior

System.ArgumentException: 'IDX11025: Cannot serialize object of type: 'System.Guid' into property: 'appid'.'

Possible solution
New serializer logic could serialize Guids as strings (as the Newtonsoft implementation did)...