BUG: make Index.where behavior mirror Index.putmask behavior
- [ ] closes #xxxx
- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry

needs a rebase. can you add a whatsnew on what is changing here one more rebase rebased + green can you merge master rebased + finally green