Set DEFAULT_OBJECT_TYPES as a list of strings to avoid casting

app/services/geo/file_download_service.rb

@@ -3,10 +3,10 @@ module Geo
     attr_reader :object_type, :object_db_id
 
     LEASE_TIMEOUT = 8.hours.freeze
-    DEFAULT_OBJECT_TYPES = [:attachment, :avatar, :file].freeze
+    DEFAULT_OBJECT_TYPES = %w[attachment avatar file].freeze
 
     def initialize(object_type, object_db_id)
-      @object_type = object_type
+      @object_type = object_type.to_s
       @object_db_id = object_db_id
     end
 
@@ -30,13 +30,13 @@ module Geo
 
     def downloader_klass_name
       klass_name =
-        if DEFAULT_OBJECT_TYPES.include?(object_type.to_sym)
-          :file
+        if DEFAULT_OBJECT_TYPES.include?(object_type)
+          'file'
         else
           object_type
         end
 
-      "Gitlab::Geo::#{klass_name.to_s.camelize}Downloader"
+      "Gitlab::Geo::#{klass_name.camelize}Downloader"
     end
 
     def try_obtain_lease

app/services/geo/file_upload_service.rb

 module Geo
   class FileUploadService
-    DEFAULT_OBJECT_TYPES = [:attachment, :avatar, :file].freeze
+    DEFAULT_OBJECT_TYPES = %w[attachment avatar file].freeze
     IAT_LEEWAY = 60.seconds.to_i
 
     attr_reader :object_type, :object_db_id, :auth_header
@@ -30,13 +30,13 @@ module Geo
 
     def uploader_klass_name
       klass_name =
-        if DEFAULT_OBJECT_TYPES.include?(object_type.to_sym)
-          :file
+        if DEFAULT_OBJECT_TYPES.include?(object_type)
+          'file'
         else
           object_type
         end
 
-      "Gitlab::Geo::#{klass_name.to_s.camelize}Uploader"
+      "Gitlab::Geo::#{klass_name.camelize}Uploader"
     end
 
     def log(message)