Dancer::Serializer::Mutable - (De)Serialize content using the appropriate HTTP header
This serializer will try find the best (de)serializer for a given request. For this, it will go through:
Serialize a data structure. The format it is serialized to is determined automatically as described above. It can be one of YAML, XML, JSON, defaulting to JSON if there's no clear preference from the request.
Deserialize the provided serialized data to a data structure. The type of serialization format depends on the request's content-type. For now, it can be one of YAML, XML, JSON.
Returns the content-type that was used during the last serialize / deserialize call.
WARNING : you must call serialize / deserialize before calling content_type.
Otherwise the return value will be undef.
