Support multiple names in JsonSubType.Type

[swayamraina]

This issue is linked to FasterXML/jackson-annotations#171

[swayamraina]

link to PR : #2762

[cowtowncoder]

PR looks good; added note on #2762 wrt CLA.

[cowtowncoder]

@swayamraina I finally got this all merged: thank you very much for this contribution! It will be included in 2.12.0 release.

[swayamraina]

@cowtowncoder should I also raise an issue to remove the singular version of this field to be removed in 3.0.0?

[cowtowncoder]

I thought about that, and it would otherwise make sense but I am planning to keep 2.x and 3.x annotations compatible -- so that unlike all other components, you can actually use either one.
That is, 2.x annotations will work with 3.x and vice versa: so there is no major version difference for annotations. This is based on my experiences with 1.x -> 2.x upgrade where the only recurring issue users have is that with auto-completion they sometimes gets Jackson 1.x annotations which will not work with 2.x.

So at this point I think this sub-optimality can live on. Thank you for suggesting it though, it is good to follow up properly with clean up, keeping codebase as tidy as possible.

[swayamraina]

sure, this also makes sense.