[disafronov]

Invalid extra containing an object whose repr raises (or returns a non-string) currently aborts SchemaLogger before the main record is emitted. This contradicts the README's contract that invalid data is dropped and reported separately without raising from the logging call.

Add a private safe repr helper for diagnostic fields, preserving ordinary repr output and substituting a constant <unrepresentable value> when repr fails. The fallback does not format the object or exception again. Public API, strict type checks, schema projection, and fatal schema-configuration behavior are unchanged.

Add eight regression cases covering raising and non-string repr for wrong types, unknown fields, empty schemas, and invalid list elements. They verify preservation of valid fields, rejection of invalid fields, main-record-before-ERROR ordering, aggregation, and JSON string diagnostics.

Validation:

• All eight regression cases fail on the original implementation and pass with the fix.
• UV_CACHE_DIR=/tmp/uv-cache make all on Python 3.14.4: 228 tests passed; 100% statement and branch coverage; Black, isort, Flake8, mypy, Bandit, and Vulture passed.
• git diff --cached --check passed.
• Other Python versions are covered by the repository's CI matrix; not run locally.

[disafronov]

🎉 This PR is included in version 1.0.3-rc.1 🎉

The release is available on GitHub release

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