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Out of interest, how does this work? In my ignorance, I'd have imagined a number of different chemicals with similar properties DMT that would also dissolve in the naptha. Does DMT just happen to have highly unique properties?

An interesting use case I saw was on a complex VoIP system with lots of internal message passing, following an actor model. There were tens of thousands of unit tests to assert all kinds of crazy interop scenarios, and the system clock was mocked out globally.

So you could set up multiple incoming streams, advance the clock to a very high level of precision and assert e.g packet A triggered packet B after 20ms, or timer X fired after 1s. This made the tests extremely reliable and fast to run, since you were pretty much CPU bound - something that I don't think would have been otherwise possible.

I also had this sentiment, but I feel like VSCode as of late has pretty much proved this wrong. There's no discernable difference in responsiveness to me between it and any other native IDE I've used. And it's a pretty complex example.

I was really impressed with one of the interview rounds I was given at Microsoft - I was shown a mock code review and asked to comment on bugs (ranging from easy to spot like null reference exceptions, to harder like race conditions and edge cases) and code quality.

It felt like good fair test of someone's day to day ability, isn't really something you can grind for, and presumably also gives quite a good quantitative measure of a candidate if you assign a weight to each bug/quality suggestion.

Amazon is in an unusual place of both controlling the market and entering the market however. That doesn't really fit with the nice simplistic ideological "Free market" concept. It's hard to see any motivation for them not to game the system if there's no regulation preventing it.