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Remove all of the hacks and support infrastructure around Rack sessions. Rails provides this by default so we don't need it for 90% of users. The other 10% should know and provide a Rack session.
This is a big change and has the potential to break many installs. It will be part of the 7.0 major version bump and require a lengthy beta period to ensure we document as many edge cases and solutions as possible.
See also #4671, #4728 and many others.