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HTTP::Headers#key? correctly converts
Previously if you were looking for a given key, the header may incorrectly tell you that it did not exist even though it would return a valid value: ```ruby env = { "CONTENT_TYPE" => "text/plain" } headers = ActionDispatch::Http::Headers.new(env) headers["Content-Type"] # => "text/plain" headers.key?("Content-Type") # => false ``` This PR fixes that behavior by converting the key before checking for presence
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