pandas version 0.13.0 does not give warning when summing float with object
Good afternoon,
I have just installed pandas 0.13.0 and was observing some strange results produced by old codes.
One major issue is that I found that when summing two columns of a DataFrame, one of which is a float64 and the other an object, the result includes just the float64 columns.
This would be not an issue per se, but no warning message is displayed.
I think a warning in this case is of paramount importance.
