@Zheaoli, I appreciate you taking the time to do this, but somebody else is already working on _BINARY_SLICE. Part of the reason I created an issue for this was so we could coordinate the work, rather than having multiple people racing on the same tasks.

Is it okay if we close this? FYI, one issue I see here is that there is no guarantee that slicing an arbitrary object will give you the same class (we need to check for some common classes instead):

>>> import mmap
>>> mm = mmap.mmap(-1, 42)
>>> type(mm)
<class 'mmap.mmap'>
>>> type(mm[:])
<class 'bytes'>

I appreciate you taking the time to do this, but somebody else is already working on _BINARY_SLICE. Part of the reason I created an issue for this was so we could coordinate the work, rather than having multiple people racing on the same tasks.

Sorry about this！ I have not noticed this has been assigned.

Is it okay if we close this?

Sure!

one issue I see here is that there is no guarantee that slicing an arbitrary object will give you the same class (we need to check for some common classes instead):

Thanks about the explain. You prove one of my guess.