nledez / flask-fs2

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feat(swift): verify ETag for seekable file-likes and recycle abandoned pool slots

  Two integrity/robustness fixes in the Swift backend:

  - _precompute() now hashes seekable file-likes from their current
    position and restores it, so uploads get a Content-Length and a
    server-side ETag check instead of an unverifiable chunked transfer.
    Non-seekable streams still pass through unchanged.
  - _PoolReleasingStream registers a weakref.finalize callback that closes
    the Connection and puts an empty slot back in the pool when a stream is
    dropped without close() (e.g. an HTTP client disconnecting mid-download).
    Previously such a stream leaked its slot until process exit, eventually
    starving the pool with PoolExhaustedError.

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