module Jekyll
  module Drops
    class Drop
      class << self
        # NOTE fixes "warning: instance variable @is_mutable not initialized"
        prepend (Module.new do
          def mutable?
            @is_mutable ||= nil # rubocop:disable Naming/MemoizedInstanceVariableName
          end
        end)
      end
    end
  end
end if defined? Jekyll::Drops::Drop