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371e9a9870
The multipart receive buffer is immediately written by httpd_req_recv() before any read occurs, and only recv_len bytes (the amount actually received) are subsequently passed to the parser. Zero-initialization via make_unique is therefore unnecessary overhead. Switch to C++20 make_unique_for_overwrite which skips value-initialization for POD types, avoiding a redundant memset of the 1460-byte buffer on every multipart upload request.
