Create missing ZIP archives in append mode - #2139
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Fixes #2138.
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ZipFileSystem(fo="memory://new.zip", mode="a")currently raisesFileNotFoundError: the underlyingr+bopen fails beforeZipFilecan create the archive. Retry a missingOpenFileinw+bmode, while preserving the existingr+bpath for archives that already exist. Other open failures still propagate.The regression tests create an archive in append mode, reopen it to append a second entry, and check both entries’ contents on local and memory filesystems. Both cases fail before the fix. The ZIP and archive suites pass with 131 passed, 19 skipped (optional backends unavailable); Ruff and formatting checks pass. Includes a changelog entry.
Prepared with OpenAI Codex.