[thekevinbot]

Fixes #1586

serde_json's default float parser is fast but not correctly rounded, so a JSON float from an on-file hook could be stored one ULP off (123456789.12345679 became 123456789.1234568). This PR enables serde_json's float_roundtrip feature in the workspace Cargo.toml. Every JSON number dirsql reads now parses to the exact double: hook rows, inferred path tables, and worker-function replies.

Red

The test-only commit a6df2e9c failed CI for the reason the test asserts: https://github.com/thekevinscott/dirsql/actions/runs/41879125994/job/126746720725
(left: [Real(123456789.1234568), ...] / right: [Real(123456789.12345679), ...])

Tests:

• packages/rust/tests/on_file_float.rs: integration test with a declared v REAL table
• packages/rust/tests/on_file_float_e2e.rs: CLI e2e test of the issue's repro with an inferred path table

Checked by hand with the release binary: the issue's repro prints [{"v":123456789.12345679,"eq":1}]. A run of 20,000 random doubles from Python json.dumps came back with 0 mismatches.

E2E Verification

• Ran e2e suites locally for every affected SDK
• Python SDK e2e: pass (impacted subset)
• TypeScript SDK e2e: pass (impacted subset)
• Rust core e2e (if applicable): pass
• packages/python/e2e-attestations/<branch>.json receipt written if packages/python changed (just e2e-attest-python)
• packages/ts/e2e-attestations/<branch>.json receipt written if packages/ts changed (just e2e-attest-ts)
• Command(s) run:
  • testing-conventions e2e attest 'uv run python -m pytest tests/e2e/on_file_query_test.py tests/e2e/jsonl_parse_speed_test.py tests/e2e/use_case_transcripts_test.py tests/e2e/query_contract_test.py -x -q' (after maturin develop --release and cargo build --release --features cli)
  • testing-conventions e2e attest 'pnpm exec vitest run --dir tests/e2e query-contract query-params' (after pnpm build)
  • cargo test -p dirsql --features cli --test on_file_float_e2e --test on_file_e2e --test path_table_on_file_e2e --test json_text_e2e --test functions_e2e (plus the on-file, schema-inference and functions integration tests)
• Result summary: Python 14 passed (this includes the JSONL parse speed test). TypeScript 10 passed. All Rust tests listed passed.

Changelog / Migrations

• Changelog fragment added under <root>/<pkg>/changelog.d/ for each changed package (or: skip-changelog trailer on a commit with reason)
• Migration fragment with the same slug added under <root>/<pkg>/migrations.d/ for each changed package (every subsection but Summary _None._ when nothing breaks)