Add an `@implNote` to clarify the behavior when these methods are called. A new test is added.
------------- Commit messages: - the implNote and new test Changes: https://git.openjdk.org/jdk/pull/9667/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9667&range=00 Issue: https://bugs.openjdk.org/browse/JDK-6587699 Stats: 75 lines in 2 files changed: 75 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/9667.diff Fetch: git fetch https://git.openjdk.org/jdk pull/9667/head:pull/9667 PR: https://git.openjdk.org/jdk/pull/9667
