RFR: 6323374: (coll) Optimize Collections.unmodifiable* and synchronized* [v4]

Tue Feb 23 16:21:41 UTC 2021

On Tue, 23 Feb 2021 06:12:54 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Is there any behavior change here that merits a CSR review?

Maybe. The one observable change is that calling `Collections.bar(foo)` with a `foo` that is already a `bar` will return the instance rather than unnecessarily wrap it. This could change semantics in applications inadvertently or deliberately relying on identity.

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PR: https://git.openjdk.java.net/jdk/pull/2596