[arin30]

Assigning an invalid value to a bytearray element raises JsonPointerException, but appending that same value leaks TypeError:

set_pointer(bytearray([1]), '/0', 'invalid')  # JsonPointerException
set_pointer(bytearray([1]), '/-', 'invalid')  # TypeError

Catch append's TypeError alongside the existing immutable-sequence error, using the same Invalid assignment target message as indexed assignment. This also covers appends through create=True, including attempts to attach a newly built intermediate dictionary to a typed sequence.

Three regression tests cover invalid values, invalid intermediate children, valid appends, and inplace=False. Eight append subcases fail on unchanged master; the existing-index and valid-append controls pass.

Validation on Python 3.12.14: all 88 tests pass, Flake8 passes, and git diff --check is clean. No API or type stub changes.

[Copilot]

🟢 Approval recommended

No active review issues were identified for the change aligning sequence append errors with indexed assignment.

No open issues 🎉

What changed in this PR

This PR makes sequence append errors consistent with indexed assignment by wrapping append TypeError exceptions in JsonPointerException.

Changes:

• Preserve the existing “Invalid assignment target” message for invalid appends.
• Add regression coverage for invalid values and intermediate children with create=True, valid appends, and inplace=False behavior.

File	Description
tests.py	Adds typed-sequence append tests covering failures, successful appends, and mutation behavior.
jsonpointer.py	Catches append TypeError alongside AttributeError and updates the explanatory comment.

_{Review effort: Balanced}

[coveralls]

coverage: 98.857% (+1.1%) from 97.714% — arin30:fix/sequence-append-type-error into stefankoegl:master