code: def aggregate_options(
      manager: OptionManager,
      cfg: configparser.RawConfigParser,
      cfg_dir: str,
      argv: Sequence[str] | None,
  ) -> argparse.Namespace:
      """Aggregate and merge CLI and config file options."""
      # Get defaults from the option parser
      default_values = manager.parse_args([])
  
      # Get the parsed config
      parsed_config = config.parse_config(manager, cfg, cfg_dir)
  
      # store the plugin-set extended default ignore / select
      default_values.extended_default_ignore = (
          manager.extended_default_ignore
      )
      default_values.extended_default_select = (
          manager.extended_default_select
      )
  
      # Merge values parsed from config onto the default values returned
      for config_name, value in parsed_config.items():
          dest_name = config_name
          # If the config name is somehow different from the destination name,
          # fetch the destination name from our Option
          if not hasattr(default_values, config_name):
              dest_val = manager.config_options_dict[config_name].dest
              assert isinstance(dest_val, str)
              dest_name = dest_val
  
          LOG.debug(
              'Overriding default value of (%s) for "%s" with (%s)',
              getattr(default_values, dest_name, None),
              dest_name,
              value,
          )
          # Override the default values with the config values
          setattr(default_values, dest_name, value)
  
      # Finally parse the command-line options
      return manager.parse_args(argv, default_values)
  
file_path: flake8/src/flake8/options/aggregator.py
imports: from __future__ import annotations
  import argparse
  import configparser
  import logging
  from typing import Sequence
  from flake8.options import config
  from flake8.options.manager import OptionManager
label_desc: Use image node_id 1 for calling a global function with example usage: aggregate_options(manager, cfg, cfg_dir, argv) and returns: manager