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wire 2026-10-17
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Β© 2026 RepoJournal Home Showcase How it works Privacy

$ the-wire Β· showcase

FastAPI 0.143.3 fixes non-finite floats in JSONL and SSE streams

By RepoJournal Β· Filed Β· About FastAPI & Pydantic Β· Composed from the cited sources Β· methodology

tiangolo pr-submit[bot]
2 people shipped this
tiangolo @tiangolo 2 cited pr-submit[bot] @pr-submit[bot] 1 cited

FastAPI 0.143.3 ships a serialization fix for NaN and infinite floats in JSONL and SSE streaming responses, closing the gap between streamed and non-streamed output.

πŸ”– Release version 0.143.3 (#16510) fastapi/fastapi

by pr-submit[bot]

Version 0.143.3 is a single-fix release: it carries only the non-finite float serialization change, so upgrading is a low-risk bump if your routes stream JSONL or SSE and any response model can produce NaN or infinity.

πŸ› Fix non-finite float serialization in JSONL and SSE streams fastapi/fastapi

by tiangolo

The pull request corrects how non-finite floats are serialized in JSONL and SSE streams. It was AI-assisted, per the PR note: made with Codex using gpt-6-astra and "manually reviewed."

πŸ› Fix non-finite float serialization in JSONL and SSE streams (#16509) fastapi/fastapi

by SebastiΓ‘n RamΓ­rez

The change landed as a single squashed commit on master, the only code change in the release. If your streaming tests compare float output against the non-streaming path, expect previously divergent values to match.

$ ls fastapi/reviews/ # the step-back reads

the week in review Pydantic drops Python 3.10, then layers serialization fast paths the month in review Five Pydantic validation bypasses and a quadratic URL check
Full archive β†’ Weekly reviews β†’

Quick answers

What shipped in FastAPI & Pydantic on October 17, 2026?
FastAPI 0.143.3 ships a serialization fix for NaN and infinite floats in JSONL and SSE streaming responses, closing the gap between streamed and non-streamed output. In total, 3 commits, 2 pull requests, and 1 releases landed.
Who contributed to FastAPI & Pydantic on October 17, 2026?
2 developers shipped this update, including tiangolo and pr-submit[bot].
What were the notable FastAPI & Pydantic updates?
πŸ”– Release version 0.143.3 (#16510), πŸ› Fix non-finite float serialization in JSONL and SSE streams, and πŸ› Fix non-finite float serialization in JSONL and SSE streams (#16509).
β™₯

$ log FastAPI & Pydantic --recent

Pydantic fixes GC tracking in pydantic-core and caches UTC TzInfo 50 shipped Pydantic drops Python 3.10, accepts list and DecimalTuple for Decimal 37 shipped Pydantic reworks `TypeAdapter` call arguments, tightens `Decimal` schemas 13 shipped FastAPI bumps pillow and dnspython, Pydantic corrects arguments JSON Schema 6 shipped

$ log --all # elsewhere on the wire

Agent Security Quiet day in agent security as guard coverage reaches four clients Alignment & Post-training verl defaults Ascend RL mode, open-instruct unblocks SFT packing

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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