Cinder: Instagram's performance-oriented fork of CPython 5 years ago
How similar is it to RPython?
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rlamy
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PyPy 2.6.0 released 11 years ago
Well, there is a GSoC student working on precisely that, right now.
HippyVM goes to Y Combinator and fails 11 years ago
It's the wrong level: the RPython toolchain has no notion of PHP-level types, they're entirely implemented by the interpreter. Besides, optional static types are nearly useless (performance-wise) when you have a JIT.