DESCRIPTION:
I found a FIXME in bin/regrade.py (line 216) concerning how the script identifies whether a submission belongs to a user or a team.

Currently, the script uses a heuristic based on the presence of an underscore in the directory name (my_who):

# bin/regrade.py:216-224
# FIXME: This will be incorrect if the username includes an underscore
if '_' not in my_who:
    my_user = my_who
    my_team = ""
    my_is_team = False
else:
    my_user = ""
    my_team = my_who
    my_is_team = True

This logic fails for:
Users with underscores: A user with ID jane_doe will be incorrectly classified as a Team.

PROPOSED FIX:
The script already loads the build configuration (datastore). I plan to use the team_assignment boolean from that config to definitively decide if the folder represents a User or a Team, removing the fragile underscore check.

If you are ok with this approach, I will work on the fix.