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Revert "Convert StrongParameters cache to a hash. This fixes an unbou…
…nded" We cannot cache keys because arrays are mutable. We rather want to cache the arrays. This behaviour is tailor-made for the usage pattern strongs params is designed for. In a forthcoming commit I am going to add a test that covers why we need to cache by value. Every strong params instance has a live span of a request, the cache goes away with the object. Since strong params have such a concrete intention, it would be interesting to see if there are actually any real-world use cases that are an actual leak, one that practically may matter. I am not convinced that the theoretical leak has any practical consequences, but if it can be shown there are, then I believe we should either get rid of the cache (which is an optimization), or else wipe it in the mutating API. This reverts commit e63be27.
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