Change of index values dtype should be reflected in index type
This PR should eventually address issue #9966. I will look at testing first to make sure I have understood how pandas ought to work in these situations.

Tests should fail for now.

@jreback Do you agree that the inplace multiplication in 6279449 should raise an Exception? I guess what I'm really asking is if there is a way an object can change its type in response to an inplace operation? There might be, because this works for simple ints and floats.
 in place are disable as Index are disabled anyhow
so u can test for this but it shouldn't work (eg test that it raises)
 want to update for 0.17.0?
 can you update?
 Sorry I haven't gotten back to you before. I'm afraid I'll be to busy to be
able to finish the remaining parts here.

2015-06-27 1:34 GMT+02:00 jreback notifications@github.com:

> can you update?
> 
> —
> Reply to this email directly or view it on GitHub
> https://github.com/pydata/pandas/pull/9974#issuecomment-115917725.
 closing in favor of #10638 
