API: copy(deep=False) -> view?

[jbrockmendel]

These should behave the same, shouldn't they? If so, we should use the more standard usage (view).

Ditto for _shallow_copy() with no args.

[jorisvandenbossche]

About what object are you talking?
I suppose Series or Index, since ExtensionArrays don't have a deep keyword (this was removed #27083).

For Series, based on a quick look, a difference right now is that copy(deep=False) reuses the same array object, while view always takes a view of the array.
(not saying this is necessarily a good difference, to be clear, just looking at what potential differences in implementation right now are)

[jbrockmendel]

I suppose Series or Index

Yes.