• Eliminates the code path that reused a tee object input as part of the output.
• Updated the rough equivalent recipe to have better fidelity to the actual C code.
• Removed a note about using the tee input. It is generically true of all iterator pass throughs and the note made it seem like a caution specific to tee where a tee-of-a-tee is the exception to the rule.

• Issue: Incorrect optimization in itertools.tee() #123884

📚 Documentation preview 📚: https://cpython-previews--124490.org.readthedocs.build/