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My understanding was that the prime original motivation for unchecked mode was indeed performance. As our Dart implementations are getting more mature, we're starting to get a better picture of how it does actually impact performance.

I think what we're starting to see is that the performance implications aren't that bad. Given that, I think we're focusing less and less on production mode. It's still a valid option and it may make sense for some users but it may not be commonly used, sort of like -Ofast in gcc.

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