I am sorry to hear that this bug was closed based on the unproven assumption that this would impact teaching material.  I have *never* seen any pedaggical material for the turtle module where the instructor wrote "use left() to have the turtle turn right, and vice-versa".

I file the original bug report and the code to fix it based on a report on the edu-sig mailing list, more than 3 years ago https://mail.python.org/pipermail/edu-sig/2015-March/011207.html

This bug makes it pedagogically unwise to set the coordinate system as described since a left() instruction makes the turtle turns right, and vice-versa. So, no one using the turtle module to teach can currently use this type of coordinate choice as it would be too confusing to students.  The solution provided would have fixed that.

If that is the final decision, then so be it - and I will advise people to use Brython's turtle module instead as it does not have this bug.