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fix: read caller-supplied files as utf-8-sig, so a UTF-8 BOM is not data - #1398
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…OM is not data
A questions or batch file written by Notepad or Excel starts with a UTF-8 BOM. Both
readers opened the file as plain utf-8, so the BOM became U+FEFF: `json.load` refused a
valid questions file ("Unexpected UTF-8 BOM (decode using utf-8-sig)"), and a batch file
sent U+FEFF as the first character of the first request, which the model then read as part
of the text. A piped `--batch -` stream had the same leak.
The other file readers in this repo already open as utf-8-sig for this reason
(docker/entrypoint.py, laya/train.py, scripts/http_inference_smoke.py). utf-8-sig reads
plain UTF-8 unchanged when there is no BOM.
The same BOM one layer down: `_read_json_object` opened the artifact as plain utf-8, so a checkpoint config or report written by a Windows editor was refused as "not valid JSON" for a file that is valid JSON. `laya/train.py` and `docker/entrypoint.py` already open their caller files as utf-8-sig for this reason; a file without a BOM reads identically. `tests/test_evidence.py` gains one check (97 → 98).
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24 PRs. Vietnamese kept off the English checkpoint (#1392), deciding-window attribution preserved through end hooks (#1369), RemoteRouter identifying itself with a configurable User-Agent (#1396), ten more inputs refused where they enter (#1372, #1394, #1397, #1398, #1400, #1401, #1402, #1403, #1404, #1405, #1406), per-language temperatures and per-call budgets in .NET and Rust (#1370, #1371), .NET calibration files (#1384), the Go router lifecycle, SHA-256 pins and routed inference (#1374, #1379, #1395), a C++ foundation (#1399, #1407), and parity-lane sharding that replaces the budget headroom added for 0.4.16 (#1373, #1375). Verified before tagging: all 92 suites pass, 640 tests, up from 612. ruff clean on both lists. laya-ts 1251 tests across 44 files, tsc --noEmit clean. Every generated-artifact gate clean on CPython 3.12 / unicodedata 15.0.0: Java 20 families match laya (9 unverified), UnicodeTables matches CPython 15.0.0, LanguageTables matches laya/lang.py, three Go tables_gen.go match, both laya-cpp .inc files match. Version agrees across pyproject.toml, laya.__version__ and nix/package.nix. README carries 0.4.17 only. Security audit of the merge diff, 362766 added lines over 480 files: zero obfuscation, zero secrets, zero boundary hits, zero binaries, no mode or symlink changes, 20 of 20 actions SHA-pinned including the new cpp.yml, npm install hooks unchanged, and no third-party host in any added line (example.com 90, github.com 2, download.pytorch.org 1, docs.rs 1). The 12 dynamic-exec hits are the C++ test harness invoking its own checker through sys.executable, the Go sample generator reading laya's own example by AST at development time, and one comment in rust.yml. Held: #1364 (unchanged, it moves a cross-port contract), #1381 (a #[doc(hidden)] but pub Rust hook that would ship as public API able to replace the forward pass), #1386 (route_batch switched from self.route to self._route, silently bypassing subclass overrides the docstring promises), and nine stacked port PRs that conflict with each other and need linearizing (#1377, #1378, #1380, #1382, #1383, #1385, #1387, #1388, #1389, #1390). Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Merged. Reading it as data is exactly the failure worth preventing, because it does not raise. It produces a near miss that looks like a content mistake. One note on the merge. This landed alongside #1397 and both add a block to the same part of Shipped in 0.4.17. |
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A UTF-8 BOM — what Notepad and Excel write — is either refused or silently corrupted by the two CLI readers and by the evidence reader.
What happens
For a batch file the failure is silent: the BOM becomes U+FEFF at the front of the first request, so the model reads it as part of the text (the same for
cat batch.txt | laya --batch -).laya-evals evidence --checkpoint DIRrefuses a config or report saved the same way.Why
load_questions,read_batch_lines(file and piped stdin) and_read_json_objectopened their input as plainutf-8. The other file readers in this repo already useutf-8-sigfor exactly this reason —docker/entrypoint.py("a secret file written by a Windows editor"),laya/train.py("UTF-8 BOM headers from Excel"), andscripts/http_inference_smoke.py.utf-8-sigreads plain UTF-8 unchanged when there is no BOM, so nothing that works today changes.Change
Three CLI opens (questions file, batch file,
--batch -stdin reconfigure) and one evidence open. CLI/evidence only; no library behaviour changes.Tests
tests/test_cli.py: a BOM-prefixed questions file parses and answers (exit 0, questions unchanged); a BOM-prefixed batch file yields["first ticket", "second ticket"]rather than"\ufefffirst ticket"; the same for a piped stream. Without the change208 passed, 3 failed; with it211 passed, 0 failed.tests/test_evidence.py: a BOM-prefixed artifact parses. Without the change the check reportsrefused: … is not valid JSON: Unexpected UTF-8 BOM (decode using utf-8-sig); with itall 98 checks passed.Run as
PYTHONPATH=<deps>:<repo> python3 tests/test_cli.py/python3 tests/test_evidence.py(the CLI suite stubs the Router; no weights are loaded).