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Ref: #236
Rack 3.0 was released recently and has a number of breaking changes and deprecations. We should lock to the prior version until we have explicitly validated support for all the breaking changes.
https://github.com/rack/rack/blob/main/CHANGELOG.md#300beta1---2022-08-08
Locally I get 10 rspec failures if I naively upgrade to rack 3 and run
bundle exec rspec
: