[issue42454] Move slice creation to the compiler for constants

[Batuhan Taskaya]

Batuhan Taskaya <isidentical at gmail.com> added the comment:

> What are the potential benefits or drawbacks for the user?

The only potential drawback that I can see is that it prevents you from distinguishing a sequence from mapping by 'accidentally' passing a slice. 

The major benefit for users is that they will have a decent speed up on their slice access. Other than that, I can think of some scenarios where the slice objects can be usable. One thing that I just came up with is this example (https://gist.github.com/isidentical/a799c4ae5c318bb7ac1a9f101cb709c7). I don't claim that we are implementing this to support these kinds of obscure cases, but it doesn't hurt anyone (beside maybe become a little bit confusing for a second) and doesn't look odd when used with a decent purpose.

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<https://bugs.python.org/issue42454>
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