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fix: Binary.Scan 复制驱动返回的字节切片，避免连接读缓冲复用导致 BLOB 数据错乱 - #40
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database/sql 会把驱动返回的 []byte 原样交给 Scanner，go-sql-driver/mysql 的结果切片指向连接读缓冲；直接持有会让已读出的 BLOB 在下一次查询后被覆盖。改为 append 复制一份独立副本。
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database/sql 会把驱动返回的 []byte 原样交给 Scanner，go-sql-driver/mysql 的结果切片指向连接读缓冲；直接持有会让已读出的 BLOB 在下一次查询后被覆盖。改为 append 复制一份独立副本。