Last week I published a post about nine measurement bugs I found in my own evaluation harness , all of which happened to favour my results. Two readers replied with things I hadn't found. Both were about my checks rather than my numbers. I verified both and fixed both. My results did not change at all. That turned out to be the interesting part. Reader one: a canary that could not detect what it claimed to Some setup. The harness mutates a source file in a temp copy and ru...