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You may notice in the new_framework_defaults_7_0.rb file mentioning the impact of this change, which is cache invalidation. In order to gather some more information I looked at the ActiveSupport::Digest which basically has just 3 class methods, a setter & getter for hash_digest_class and the hexdigest method. Furthermore, I searched across the rails/rails repo to find the usage of ActiveSupport#hex_digest_class (if interested this link leads to the search results) to find most of its usage only around code that deals with caching. This included caching of views, active_record queries, http ETAGs and also cache keys for the cache store you have set e.g. redis, filestore etc.