Expression Language isJson and AttributesToJSON processor do not consider an attribute with leading and trailing spaces to be JSON

If there is an attribute which has embedded JSON but it has leading and and trailing spaces e.g.

"\n{\"name\":\"John\", \"age\":30, \"car\":null}\n"

the NIFI Expression Language isJson method does not consider it JSON and the AttributesToJSON processor when the JsonHandlingStrategy is NESTED does not consider it JSON. This is contrary to Jackson's ObjectMapper behavior which will parse the above example as a map.