Jukka Lehtosalo comments

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                                            Jukka Lehtosalo

Add low-level features to improve speed and reduce memory use

Yeah, I'll write more about some of the other items. Here's an issue about fixed-width integers with some more detail: #837

Add low-level features to improve speed and reduce memory use

I've started prototyping some of these and the implementation of always defined attributes, fixed-width integers and packed arrays doesn't seem very difficult (but it's still quite a lot of work)....

Add low-level features to improve speed and reduce memory use

My thoughts about packed arrays: #840

Add low-level features to improve speed and reduce memory use

More details about record types: #841

mypyc potentially using distutils before setuptools patches

Hmm importing setuptools takes over 200ms on my laptop. Importing mypyc takes about 450ms, so this would possibly slow down use cases where we don't need setuptools (e.g. some tests)...

mypyc potentially using distutils before setuptools patches

I'm pretty sure that deleting a module from `sys.modules` doesn't reliably free it. A better way to measure import cost is do something like `time python -c 'import foo.bar'`, and...

isinstance failure with complex class hierarchy

If we split the isinstance check, it seems to work okay: ```py def g(x: SymbolNode) -> None: if isinstance(x, FuncBase): print(x) elif isinstance(x, Decorator): print(x) else: print('no match') g(FuncDef()) g(Decorator())...

Subclasses of dict and other stdlib classes don't use native method dispatch

This also affects enum classes (python/mypy#11546) at least.

Implementing an abstractproperty with a regular attribute doesn't work

@Ashu-1309 Feel free to start working on this. We don't use GitHub "Assignees" very often unless it's a a big issue that takes a long time to work on.

int is not a Number?

I'm not sure if the other ABCs beyond `Number` are very straightforward either. It would be an interesting exercise for somebody to write a prototype stub (using the protocol PR)...