1. FastAPI latest news
FastAPI 0.149.0–0.151.0 stable releases change empty forms, files and JSON null
GitHub releases and PyPI uploads are confirmed. Version 0.149.0 treats empty scalar values in form models as missing; 0.150.0 treats unselected file inputs as missing. Named zero-byte files remain valid. Version 0.151.0 distinguishes explicit JSON null from omission: omit a value to request its default. Review input validation and code relying on defaults before upgrading.

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