Windows 10 + Python 3.14 py.exe --help-xoptions lists -X tlbc, but I wonder why it's not documented at https://docs.python.org/3.14/using/cmdline.html#cmdoption-X.

Linked PRs

• gh-135805: Document the X option and env var for controlling thread-local bytecode #135868
• [3.14] gh-135805: Document the X option and env var for controlling thread-local bytecode (GH-135868) #135897