fix: Fix download_file single-request mode not using temp file for String/Pathname destinations#3394
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richardwang1124
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Jun 9, 2026
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Summary
Addresses #3391
Fixes
FileDownloader#single_requestto write to a temporary file before atomically renaming to the destination, matching the behavior of all other download paths (multipart, range).Previously,
single_requestpassed the destination directly asresponse_target, so the file could be observed in a partially written state by concurrent readers.