Asynchronous fsspec file operations
summary
fsspec gains async/await compatibility for http, s3, gcs backends so code can call file APIs from asyncio and run many transfers in parallel. The implementation exposes async open and bulk methods that perform bulk concurrent upload/download/copy/delete, tested at scale with hundreds of simultaneous operations and showing large wall‑time speedups. The work is practical code you can import now into pipelines, with concrete limits (per‑backend concurrency knobs) and real examples of success and failure cases.
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