[Bug] breaking change in 7: TryGetPayloadValue() changes the type of returned object (compared with Identity.Model 6.x) for the "aud" claim

[jmprieur]

Which version of Microsoft.IdentityModel are you using?
Note that to get help, you need to run the latest version.

Where is the issue?

• [ x ] M.IM.JsonWebTokens

Is this a new or an existing app?
Following-up the removal of NewtonSoft.json, the actual claim type returned by TryGetPayloadValue when passing object, is different. For instance:

If we are trying to get the value of the audience claim("aud"), when there is a single audience, previously subjectToken.TryGetPayloadValue("aud", out object claimValue) would retum claimValue as a string.
With Wilson 7.0.0, the claimValue retumed as a IList.

It is important for customers to maintain the same type.

Repro

subjectToken.TryGetPayloadValue("aud", out object claimValue);
Assert.True(claimValue is string);

Expected behavior
The claimValue for "aud" should be a string

Actual behavior
The claimValue for "aud" is now an IList (with one element)

Possible solution
Return a string if there is only one audience.

Workaround

subjectToken.TryGetPayloadValue("aud", out string claimValue);
Assert.True(claimValue is string);

[brentschmaltz]

fixed