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: dsl.rb
    path of file: ./repos/puma/lib/puma
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative 'const'
require_relative 'util'

module Puma
  # The methods that are available f
    
    def process_hook(options_key, key, block, meth)
      @options[options_key] ||= []
      if ON_WORKER_KEY.include? key.class
        @options[options_key] << [block, key.to_sym]
      elsif key.nil?
        @options[options_key] << block
      else
        raise "'#{meth}' key must be String or Symbol"
      end