code: def merge_configs(default, overwrite):
      
      new_config = copy.deepcopy(default)
  
      for k, v in overwrite.items():
          # Make sure to preserve existing items in
          # nested dicts, for example `abbreviations`
          if isinstance(v, dict):
              new_config[k] = merge_configs(default[k], v)
          else:
              new_config[k] = v
  
      return new_config
docs: Recursively update a dict with the key/value pair of another.
  
      Dict values that are dictionaries themselves will be updated, whilst
      preserving existing keys.