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fix: write to tempfile + rename to preserve mmap source

fix: write to tempfile + rename to preserve mmap source: a task in repo2rlenv-v083-pr diff (Harbor dataset). Title: fix: write to tempfile + rename to preserve mmap source

The task

**Title:** fix: write to tempfile + rename to preserve mmap source

Part of AdithyaSK/repo2rlenv-v083-pr_diff.