This is a follow up on #1136. Our experiment results show that clearing data frequently is the cause of our #1 crash. @maicki and I believe that this is because if the collection view is being used, silently clearing its data without notifying the backing UICollectionView can put it out-of-sync and causes mayhem next time the collection view processes a batch update. If you look at the stack trace closely, you'll notice that the crash doesn't occur on the same run loop that clearData is called. This made it extremely tricky to investigate and identify the root cause.
Another interesting question would be whether or not we want to clear the data during deallocation at all, since the data will be cleared out soon anyway.
* Add an experimental framesetter cache in ASTextNode2, and stop keeping framesetters around
* Update configuration schema
* Fix imports
* Fix import again and remove set statement
* Fork dealloc queue in an experiment
* Fix and put back
* Use the right selector
* Go simpler
* Clarify name
* Type inference
* Use CFTypeRefs like a boss
* Improve comments
* License header
* Introduce ASRecursiveUnfairLock and tests
* Document it and put underscores to scare people away
* Increment changelog
* Integrate it with ASDN::Mutex behind experiment
* Rename the experiment
* Love these license headers oh so much
* Move internal header because we have to
* Address Jon's feedback
* Update the dangerfile
* Make a trivial change to test new dangerfile
* Try out the new value with another trivial change
* Add a configuration API to make a unified place for pulling config from clients safely
* Specify properties for delegate
* Finish removing text experiment global enable
* Generate the config file
* Clean up configuration to fix tests
* Work on making it serializable
* Finish it up
* Fix example code
* Update sample project
* Clean up a few things
* Align with new project order
* Make it faster and update license header
* Add an option to specify your config at compile time
* Update another license header
* Add a version field, and bring interface state coalescing into configuration
* Update CA queue code
* Update CATransactionQueue tests
* Turn transaction queue on by default (for now, see comment)
* Update the tests
* Update the tests AGAIN
* Remove unused ordered set
Huy Nguyen
Adlai Holler
Garrett Moon