docs: def dict_update_overwrite_check(base, fresh):
      """
      For updating a base dict with a fresh one, returning a list of
      3-tuples containing the key, previous value (base[key]) and the
      fresh value (fresh[key]) for all colliding changes (reassignment of
      identical values are omitted).
      """
  
      result = [
          (key, base[key], fresh[key])
          for key in set(base.keys()) & set(fresh.keys())
          if base[key] != fresh[key]
      ]
      base.update(fresh)
      return result