You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: binary_compiled_content_cache.rb
    path of file: ./repos/nanoc/nanoc-core/lib/nanoc/core
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Nanoc
  module Core
    # Represents a cache than can be used to store already c
    
      def prune(items:)
        item_identifiers = Set.new(items.map(&:identifier))

        @cache.each_key do |key|
          # TODO: remove unused item reps
          next if item_identifiers.include?(key)

          @cache.delete(key)
          path = dirname_for_item_identifier(key)
          FileUtils.rm_rf(path)
        end
      end