stringify_keys and symbolize_keys have stable results.

Rails 6 uses the `Hash.transform_keys` found in Ruby 2.5 and later, and that method enumerates keys based on insertion order.  Calling `symbolize_keys`, `stringify_keys`, and their bang variants will result in the same hash every time -- the value for any key where a collision occurs is the last assigned in that enumeration

In the docs for Hash --  https://ruby-doc.org/core-2.5.0/Hash.html

> Hashes enumerate their values in the order that the corresponding keys were inserted.

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