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