For a full explanation, see the bug report [JDK-8358015](https://bugs.openjdk.org/browse/JDK-8358015).
This PR includes three related changes: * New overrides in SequencedMap view collection implementations, which improve their behavior. * Update to `@implSpec` clauses to reflect this behavior (which was previously ill-specified). * Update to a test which relied on unspecified behavior. ------------- Commit messages: - Update @implSpecs of SequencedMap view methods. - Update SequencedMap views to use SequencedMap methods instead of inheriting Changes: https://git.openjdk.org/jdk/pull/25515/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25515&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8358015 Stats: 69 lines in 3 files changed: 59 ins; 0 del; 10 mod Patch: https://git.openjdk.org/jdk/pull/25515.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/25515/head:pull/25515 PR: https://git.openjdk.org/jdk/pull/25515
