I don't know if I'd go that far. If you're talking about a quick script then sure, whatever gets the job done. But for any actual project the use of good, consistent typing does a lot for readability and future-proofing. And in strongly-typed languages it can have a notable affect on the overall functionality too.

If you can't tell from context whether something is a float or if it'll overflow the int max then you probably need to re-think the entire method.