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This is important because the commit operation needs to hash all the subtries (so if there's no modification, hashing is a wasted operation) and also the commit writes all expanded nodes to the database (so depending on the underlying database implementation, we might put a significant pointless strain on the disk io).\r\n\r\n@fjl @obscuren Please review this thoroughly. Should be simple enough but we mustn't screw this up :P\r\n\r\nObviously I need to run some more extensive benchmarks to quantify the exact gains this PR results in. 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