deep_munge

# File actionpack/lib/action_dispatch/request/utils.rb, line 10
        def deep_munge(hash, keys = [])
          return hash unless perform_deep_munge

          hash.each do |k, v|
            keys << k
            case v
            when Array
              v.grep(Hash) { |x| deep_munge(x, keys) }
              v.compact!
              if v.empty?
                hash[k] = nil
                ActiveSupport::Notifications.instrument("deep_munge.action_controller", keys: keys)
              end
            when Hash
              deep_munge(v, keys)
            end
            keys.pop
          end

          hash
        end