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artesian-product): New procedure. ("copy-file/deduplicate, sparse files (holes: ~a/~a/~a)"): New test set. Change-Id: Iad2ab7830dcb1220e2026f4a127a6c718afa8964 Ludovic Courtès 2022-12-10deduplicate: Use 'sendfile' for small file copies....* guix/store/deduplication.scm (dump-file/deduplicate): Use 'sendfile' instead of 'dump-port'. * tests/store-deduplication.scm ("copy-file/deduplicate, below %deduplication-minimum-size"): New test. Ludovic Courtès