Issue with `process_input` function with Rails 5 Parameters

[fishbein]

In Rails 4, ActionController::Parameters subclassed HashWithIndifferentAccess so lib/attachinary/utils.rb process_input called the process_hash function successfully by first hitting the Array case which then would hit the Hash case to call process_hash.

Before process_input run:

[
    [0] {
            "public_id" => "1",
        "resource_type" => "raw",
              "version" => "123",
             "filename" => "file.xlsx"
    }
]

After:

[
    [0] #<Attachinary::File:0x00007fa5b51ca360> {
                          :id => nil,
          :attachinariable_id => nil,
        :attachinariable_type => nil,
                       :scope => "documents",
                   :public_id => "1",
                     :version => "123",
                       :width => nil,
                      :height => nil,
                      :format => nil,
               :resource_type => "raw",
                  :created_at => nil,
                  :updated_at => nil,
                    :filename => "file.xlsx",
                     :user_id => nil,
           :publicly_viewable => nil
    }
]

In Rails 5, ActionController::Parameters no longer subclasses HashWithIndifferentAccess so the switch statement in lib/attachinary/utils.rb process_input hits the else case and returns the same input data.
This is not the expected behavior as it should call to_h on the input in that scenario and re-call process_input.
Before process_input run:

[
    [0] {
            "public_id" => "1",
        "resource_type" => "raw",
              "version" => "123",
             "filename" => "file.xlsx"
    }
]

After:

[
    [0] {
            "public_id" => "1",
        "resource_type" => "raw",
              "version" => "123",
             "filename" => "file.xlsx"
    }
]

self.process_input:

def self.process_input(input, upload_options, scope=nil)
      case input
      when :blank?.to_proc
        nil
      when lambda { |e| e.respond_to?(:read) }
        upload_options.merge! resource_type: 'auto'
        upload_info = Cloudinary::Uploader.upload(input, upload_options)
        process_hash upload_info, scope
      when String
        process_json(input, scope)
      when Hash
        process_hash(input, scope) # hits here in Rails 4 after hitting Array
      when Array
        input = input.map{ |el| process_input(el, upload_options, scope) }.flatten.compact
        input = nil if input.empty?
        input
      else
        input # hits here in Rails 5 because ActionController::Parameters is not a Hash
      end
    end