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cyfung1031andClaude Opus 5.5
b98505c810
`write_full` can't know the output size in advance, so its buffer grows by doubling and the result kept up to as much again unused: 28 % for a 100 MB save, 99 % for a 5 MB one. The result is often kept for as long as a document is open. It becomes the working bytes after edits that need a full rewrite (repaired files, security changes, redaction) through `write_incremental`, and it backs Save As ▸ optimized and every new document from Create, Combine, Extract and Split. `shrink_to_fit` at the end drops the unused capacity. The bytes are the same. On macOS the shrink happens in place (2 µs for 100 MB, the buffer doesn't move), and full-save times are unchanged. Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>