[records] updates for Preview 9. hashCode

John Rose john.r.rose at oracle.com
Mon Jan 13 23:51:38 UTC 2020

P.S. Another way to deal with toString is just to specify exactly
what we do (it’s not bad!) and follow up with a “subject to change”
message.  We took this tack with MethodHandle.toString:

> Future releases of this API may add further information to the string representation. Therefore, the present syntax should not be parsed by applications.

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