49                 rx=None, quiet=0, legacy=False, optimize=-1, workers=1,  argument
64     optimize:  int or list of optimization levels or -1 for level of
107                                            optimize=optimize,
118                                 legacy, optimize, invalidation_mode,
126                  legacy=False, optimize=-1,  argument
140     optimize:  int or list of optimization levels or -1 for level of
183     if isinstance(optimize, int):
184         optimize = [optimize]
188     optimize = sorted(set(optimize))
190     if hardlink_dupes and len(optimize) < 2:
206         for opt_level in optimize:
238                 for index, opt_level in enumerate(optimize):
241                                             optimize=opt_level,
244                         previous_cfile = opt_cfiles[optimize[index - 1]]
275                  legacy=False, optimize=-1,  argument
286     optimize: as for compile_dir() (default -1)
302                 optimize=optimize,
434                                         optimize=args.opt_levels,
445                                        optimize=args.opt_levels,