I've been doing this for 20 years, so maybe? But I can't recall a single one excluding painstakingly maintained documentation for a public api where the source

I've been doing this for 20 years, so maybe? But I can't recall a single one excluding painstakingly maintained documentation for a public api where the source isn't readily available. I usually try hard not to read the comments and just read the code because comments are wrong so often.