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TruffleRuby can’t run production Rails traffic today, and YJIT can.

The README states "TruffleRuby runs Rails". Anything specific?

It passes most (maybe all?) of the Rails test suite. But it can't run a randomly-selected production Rails application.

This was based on my conversations with Chris Seaton before his passing, about 6 months ago.

That doesn’t sound like a very good test suite then.