RFR: 8368178: Add specialization of SequencedCollection methods to emptyList, singletonList and nCopies

[Pavel Rappo]

On Sun, 21 Sep 2025 14:48:19 GMT, Pavel Rappo <prappo at openjdk.org> wrote:

> I think this `@implSpec` leaves us with no choice but to abide by the roundtrip property (i.e. `list.reversed().reversed() == list`):

On a second thought, no, it is not a specification for List **clients**. It's a specification for List **implementors**, so that they can decide if and how they override this method. Clients or implementors don't need to abide by it.

Although, I now wonder why the default implementation is like that. Is the roundtrip property important?

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PR Comment: https://git.openjdk.org/jdk/pull/27406#issuecomment-3316065017