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George Barnett 66a85ba0e2 Add back _NIOFileSystem (#3367)
Motivation:

In #3363 we converted `_NIOFileSystem` to `NIOFileSystem` and removed
the (unreleased) overloads for FilePath/NIOFilePath. This change adds
back `_NIOFileSystem` such that it matches the API it had at 2.86.0.

Modifications:

- Add back `_NIOFileSystem` and `_NIOFileSystemFoundationCompat` such
that their API is at 2.86.0

Result:

- `NIOFileSystem` uses `NIOFilePath`
- `_NIOFileSystem` uses `FilePath`
2025-09-02 14:56:58 +01:00
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