Allow injecting MissingNode for "absent" JsonNode via Creator (with JsonNodeFeature.MAP_ABSENT_TO_MISSING) (original) (raw)

(note: follow-up to #3214)

So: let's add JsonNodeFeature.MAP_ABSENT_TO_MISSING that allows mapping missing (absent) value, of type JsonNode, into MissingNode instead of Java null.
Default for feature should be disabled (false), for backwards-compatibility.