The history of T: https://www.paulgraham.com/thist.html
A remarkable Scheme predecessor with an optimising compiler, a pioneering tagged pointer implementation and a remarkable self-hosting GC!
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Difftastic spends a remarkable 49% of its runtime just reading and writing to a FxHashMap of ~1 million items. This hashmap stores the predecessor vertex when calculating the shortest route.
I'm running out of ideas. I can't use perfect hashmaps, are there other speed tricks?
Excellent overview of WebAssembly, its asm.js predecessor, and how the Rust ecosystem fits in: https://youtu.be/CMB6AlE1QuI
I am fascinated to learn that Multics (the Unix predecessor) was a big influence on the lisp condition system (i.e. resumable exceptions)!
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