Reduce array allocations by using a constant

app/serializers/rest/status_serializer.rb

@@ -8,7 +8,7 @@ class REST::StatusSerializer < ActiveModel::Serializer
 
  attribute :favourited, if: :current_user?
  attribute :reblogged, if: :current_user?
- 
+
  attribute :content, unless: :source_requested?
  attribute :rich_content, unless: :source_requested?
  attribute :plain_markdown, unless: :source_requested?
@@ -110,11 +110,12 @@ class REST::StatusSerializer < ActiveModel::Serializer
  return
  end
 
+ PINNABLE_VISIBILITIES = %w(public unlisted).freeze
  def pinnable
  current_user? &&
  current_user.account_id == object.account_id &&
  !object.reblog? &&
- %w(public unlisted).include?(object.visibility)
+ PINNABLE_VISIBILITIES.include?(object.visibility)
  end
 
  def pinned_by_group