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Kwak Byoung Min
62f4c9895a
* Report observed StringIO newline types Constraint: Match CPython StringIO newline reporting without changing configured newline translation. Rejected: Separate newline-tracking representation | reuse the existing SeenNewline bitflags. Confidence: high Scope-risk: narrow Directive: Keep observed newline state separate from the configured newline mode. Tested: prek run --all-files; test_memoryio; cargo clippy -p rustpython-vm --lib -- -D warnings; workspace tests excluding the macOS C-API baseline SIGSEGV. Not-tested: Full macOS workspace suite is blocked by the existing rustpython-capi SIGSEGV; the Linux suite is running. Assisted-by: Codex:gpt-5.6-sol * Preserve StringIO state boundaries Reset observed newline state when StringIO is reinitialized and keep the property subject to closed-stream checks. Constraint: Match CPython StringIO reinitialization and closed-stream behavior. Rejected: Returning stale or cached newline state | violates StringIO lifecycle semantics. Confidence: high Scope-risk: narrow Directive: Keep observed newline state tied to the current open StringIO contents. Tested: cargo test --workspace --exclude rustpython_wasm --exclude rustpython-venvlauncher; cargo run --release -- extra_tests/snippets/stdlib_io_stringio.py; cargo run --release -- -m test test_memoryio; prek run --all-files; cargo clippy -p rustpython-vm --lib -- -D warnings. Assisted-by: Codex:gpt-5.6-sol