RFR: 8252546: Move ObservableValue's equality check and lazy evaluation descriptions to @implSpec [v3]

Wed Sep 16 08:29:05 UTC 2020

On Tue, 15 Sep 2020 16:29:58 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> It's not really ready to be integrated, right? It's not finding the CSR I think.
>
> Correct. It is not yet ready. [SKARA-548](https://bugs.openjdk.java.net/browse/SKARA-548) is not yet resolved, so shows
> as ready even though it isn't.

The CSR has been approved, I'll go ahead and integrate.

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PR: https://git.openjdk.java.net/jfx/pull/292