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The CRC32, CRC32c, and CRC64NVME data integrity checksums support calculating the composite full object values for multi-part uploads using the checksum and length of the individual parts. Previously, we were reading all of the part data to recalculate the full object checksum values during the complete multipart upload call. This disabled the optimized copy_file_range() for certain filesystems such as XFS because the part data was being read. If the data is not read, and the file handle is passed directly to io.Copy(), then the filesystem is allowed to optimize the copying of the data from the source to destination files. This now allows both the optimized copy_file_range() optimizations as well as the data integrity features enabled for support composite checksum types.