Fixing types on the Python side.

[Mriswithe]

Hello,

I was going through the getting started, the primes example. I noticed my IDE was complaining about the expected types. Example

    p: cython.int[1000]

Pycharm says it should be a int[Any] which is not really a thing, we want PyCharm to expect an array of ints. Are there known ("It is known khalesi") reasons why this shouldn't be fixed, or is this an ok direction for me to poke around and potentially fix?

My goal here is to make the experience for someone using an IDE smoother by having Pycharm and Cython agree what means what. Likely in this specific case I will implement a `__getitem__` method on the cython.int class in a pyi file. 

class NewInt(cython.int):
    def __getitem__(self, item) -> Iterable["NewInt"]:
        pass

Thank you for any input/corrections/references.

[da-woods]

We're open to improvements here.

However, you may struggle - I think some of our pre-existing decisions on syntax (with memoryviews and arrays) just doesn't fit in with the increasingly formalized type-annotation syntax. I can't remember exactly why though (unfortunately).

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[Mriswithe]

I will poke around and see what I can find then.

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