Hi, I was thinking if we could add equality between array and list to work out of the box on the supported datatypes by arrays.

Currently, comparing a list and an array with the same contents returns False.

Also, creating an array of floats from a listA, then turning that array into a listB, returns different contents between listA and listB.

It's somehow counter-intuitive for me as even if the underlying implementations are different between array and list, they can be viewed as an array data structure but with different restrictions/implementations, along with that, arrays compare to each other correctly, and lists compare to each other correctly.

based on that, switching some lists to arrays in a python codebase may break some equality conditions within that code between lists and arrays

This is not clearly a good idea.  Lists and tuples with same contents do not compare equal, although set and frozenset do.  I suggest that you post this idea to python-ideas list.

I concur with Terry that this would need to be taken to python-ideas.