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: wrapper_object_cache.rb
    path of file: ./repos/pycall.rb/lib/pycall
    
    the code of the file until where you have to start completion: module PyCall
  class WrapperObjectCache
    
    def initialize(*restricted_pytypes)
      unless restricted_pytypes.empty?
        restricted_pytypes.each do |pytype|
          next if pytype.kind_of? PyTypePtr
          raise TypeError, "unexpected type of object in the arguments (#{pytype.class} for PyCall::PyTypePtr)"
        end
      end