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In general we follow the common rules for the jdk-updates project.
Please note that these common rules do not allow enhancements to be back-ported, only fixes to bugs. In some cases, for example when there is a gross performance deficit that can be fixed in a safe way, we might make an exception. However, such cases will be very uncommon.
If the backport requires more than just cosmetic changes (file location changes, copyright header updates) to apply to the 11u repository, it should first be submitted for review.
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