[techi101]

PYTHON-6237

Changes in this PR

The $maxKey parser in bson/json_util.py passed the doc as a second argument to TypeError instead of formatting it, so the error showed a raw tuple:

('$maxKey value must be 1: %s', ({'$maxKey': 2},))

Its extra-field error also said Bad $minKey. Both now use f-strings, matching the $minKey parser right above it:

$maxKey value must be 1: {'$maxKey': 2}
Bad $maxKey, extra field(s): {'$maxKey': 1, 'x': 1}

I used Claude to help find this, and I reviewed and tested the change myself.

Test Plan

Added test_minkey_maxkey_errors in test/test_json_util.py, which checks both error messages for $minKey and $maxKey. Ran pytest test/test_json_util.py: 28 passed.

Checklist

Checklist for Author

• Did you update the changelog (if necessary)?
• Is there test coverage?
• Is any followup work tracked in a JIRA ticket? If so, add link(s).

Checklist for Reviewer

• Does the title of the PR reference a JIRA Ticket?
• Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
• Is all relevant documentation (README or docstring) updated?

[aclark4life]

Thanks @techi101 ! We are tracking this here: https://jira.mongodb.org/browse/PYTHON-6237