ENH: confusing name for 'copy' argument in to_numpy() method
I found the following behavior a bit unexpected from the name of the argument.

> The default (`copy=False`) may return a copy instead of a view. `copy=True` always returns a copy, but `copy=False` does not always return a view.

I think changing the argument name to something like `always_copy` would be more clear about what it is doing.