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: plugin_list.rb
    path of file: ./repos/aws-sdk-ruby/gems/aws-sdk-core/lib/seahorse/client
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require 'set'
require 'thread'

module Seahorse
  module Client
    class PluginList

      include Enumerable

      # @param [Array, Set] plugins
      # @option o
    
        def initialize(plugin)
          case plugin
          when Module
            @canonical_name = plugin.name || plugin.object_id
            @plugin = plugin
          when Symbol, String
            words = plugin.to_s.split('.')
            @canonical_name = words.pop
            @gem_name = words.empty? ? nil : words.join('.')
            @plugin = nil
          else
            @canonical_name = plugin.object_id
            @plugin = plugin
          end