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Is there a write up anywhere of the techniques employed to keep memory usage down that other implementations aren’t doing?

The article doesn't go into super deep details but we do touch on it in the paper we've recently published: https://dl.acm.org/doi/10.1145/3617651.3622982

And I went into some more details the talk I gave at RubyKaigi 2023: https://www.youtube.com/watch?v=X0JRhh8w_4I&t=2404s