It is not that numpy bypasses public interfaces. It uses documented C APIs. V8, as far as I know, does not have that.

> Edit: Python has no JIT

In 3.14 and up you can enable JIT by setting the env var PYTHON_JIT=1

As someone who has many times dived into deep rabbit holes like this (e.g. how does JavaScript's prototype-based class work?), some effective ways to handle this is to ask follow up questions, use web search or ask for references. Deep search also helps. Often it corrects itself or takes back claims that have no basis. At the very least, it provides references that you can read yourself.

Of course, you can't really do all of that on a free plan.

That's far from ideal, but if you are motivated and care about these technical details (which you probably do), you can get pretty good results.

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Putting all of this aside, you can sometimes find YouTube videos on obscure channels that talk about these things. Chances are that someone who cares to make a YouTube video about these hardcore topics know what they are talking.

Just to name alternatives: Cpython, Pypy, jython, ironpython.

Then, there quite a few python-likes out there.

I wish they would stay precise.