<tt> -> {@code
clean up imports
Update Creative Commons license URL in legal notices
Don't use raw type for Comparable
Headers reference Creative Commons
Tweaks: Get => Returns, etc.
Improved summary docs
Removed non-standard tags and misc javadoc cleanup
Added missing javadoc tags; minor reformatting
Fixed typo: aoociated Also removed periods from @param and @return comments (not our style)
Replaced DelayEntry with Delayed interface
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