Allow use of @JsonValue on Creator methods as alias to @JsonCreator(mode=DELEGATING)

[cowtowncoder]

It seems useful (if redundant) to allow use of @JsonValue as a sort of alias for existing @JsonCreator (with mode = DELEGATING). Doing this makes sense for the common case of @JsonValue already being used to indicate serialization, like:

public class StringBean {
    private String value;

    // Instead of this, allow @JsonValue
    @JsonCreator(mode = Mode.DELEGATING)
    public StringBean(String v) {
      value = v;
    }

    @JsonValue
    public String getValue() { return value; }
}

While this may be a minor thing for Java usage, this could be particularly helpful for Kotlin module.

[yihtserns]

Is this a duplicate of #3654?

[cowtowncoder]

@yihtserns Well spotted! Yes it is. Closing.