[Gabrieljr42]

Describe your changes

b |= mapping bypasses the keypath checks used by b.update(mapping). With the default separator, b |= {'invalid.key': 1} stores an invalid literal key that cannot be accessed normally through keypaths, while update() rejects the same input.

Route KeypathDict.__ior__ through its validated update() and return the same object. Regression coverage includes pointer-backed and unwrapped dictionaries, empty updates, custom/disabled separators, unchanged data after rejection, and frozen dictionaries.

Validation: the new regression fails before the fix. The 120 focused dictionary/freeze tests and all pre-commit hooks, including Ruff and mypy, pass. A broader run passed 960 tests with 32 URL-dependent tests skipped; the complete suite could not finish against unreachable remote URL fixtures. No test configuration was changed.

Related issue

Newly reproduced bug; no existing issue found for this validation bypass.

Checklist before requesting a review

• I have performed a self-review of my code.
• I have added tests for the proposed changes.
• I have run the full test suite without errors. Remote URL fixtures were unavailable as described above; focused tests and pre-commit passed.

Implementation used a Luna agent, followed by a separate diff review and rerun of the focused tests and pre-commit hooks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.70%. Comparing base (e910141) to head (c011306).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #643   +/-   ##
=======================================
  Coverage   98.70%   98.70%           
=======================================
  Files          65       65           
  Lines        2476     2479    +3     
=======================================
+ Hits         2444     2447    +3     
  Misses         32       32           

Flag	Coverage Δ
unittests	98.70% <100.00%> (+<0.01%)	⬆️

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