All :option:`-X` options from the Python command line are now propagated to child processes spawned by :mod:`multiprocessing`, not just a hard-coded subset. This makes the behavior consistent between default "spawn" and "forkserver" start methods and the old "fork" start method. The options that were previously not propagated are: context_aware_warnings, cpu_count, disable-remote-debug, int_max_str_digits, lazy_imports, no_debug_ranges, pathconfig_warnings, perf, perf_jit, presite, pycache_prefix, thread_inherit_context, and warn_default_encoding.