Don't break configurations.each, .first before the deprecation period #36372
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Summary
I was working on a library (switchman) that uses configuration.each and realized that it was broken (despite being listed as just deprecated) relative to Rails 5. I whipped up this change to fix it but I'm not sure if this is desired at this point in the release cycle. This is a first draft meant mostly as a chance for the maintainers to say "we're too frozen for this right now"; let me know if that isn't the case and you would like me to add tests or change anything.