RFR: JDK-8134373: explore potential uses of convenience factories within the JDK

[Jonathan Bluett-Duncan]

Pavel,


> 6. I couldn't find any evidence that `resolverFields` might contain `null`.
> Am I missing a javadoc or a line of code? Maybe we should talk to java.time
> folks to see if it's the case?
>

When I ran the tests for java.time, one of them failed because `null` was
being passed to `resolverFields`, so I came the conclusion that it was
unsafe to make a change there.

Kind regards,
Jonathan