[Bug] JsonWebToken.TryGetPayloadValue() can no longer be used with string arrays

[jmprieur]

Consider the following JWT payload:

{
    "prop1": [
      "value1",
      "value2"
    ]
  "exp": 1692706803,
  "iat": 1692703203,
  "nbf": 1692703203
}

The following snippet works just fine on 7.0.0-preview but fails on 7.0.0-preview3 (TryGetPayloadValue returns false). It does work fine if you use an IList<string> instead of the string[]:

           JsonWebToken token = new JsonWebToken("{\"alg\": \"RS256\",\"typ\": \"JWT\"}", 
               "{ \"prop1\": [\"value1\",\"value2\"],  \"exp\": 1692706803,\"iat\": 1692703203,\"nbf\": 1692703203 }");

           // This does not work
           if (token.TryGetPayloadValue("prop1", out string[] array))
           {
               Console.WriteLine("The array has been correctly deserialized.");
           }

           // This does not work
           if (token.TryGetPayloadValue("prop1", out List<string> list))
           {
               Console.WriteLine("The list has been correctly deserialized.");
           }

           // This works
           if (token.TryGetPayloadValue("prop1", out IList<string> ilist))
           {
               Console.WriteLine("The list has been correctly deserialized.");
           }
       }

/cc @brentschmaltz @jennyf19 @keegan-caruso

[jennyf19]

#2246

[brentschmaltz]

Dup