ensure JWS serializers only throw InvalidArgumentException #485
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SerializerManager tries one serializer after another but expects the individual serializer only to throw InvalidArgumentException in ::unserialize - if any other Exception is thrown, unserialization (and JWS verification) fails directly.
The JSON serializers (global and flattened) try JSON-decoding using JsonConverter. The latter, however, throws a RuntimeException. Therefore, if a later serializer in the SerializerManager is applicable to the token, it's never reached.
This PR encapsulates the call to JsonEncoder and converts the exception to InvalidArgumentException.