module JSON::ParserOptions

def prepare(opts)
  if opts[:object_class] || opts[:array_class]
    opts = opts.dup
    on_load = opts[:on_load]
    on_load = object_class_proc(opts[:object_class], on_load) if opts[:object_class]
    on_load = array_class_proc(opts[:array_class], on_load) if opts[:array_class]
    opts[:on_load] = on_load
  end
  if opts.fetch(:create_additions, false) != false
    opts = create_additions_proc(opts)
  end
  opts
end