[FEATURE REQUEST] typed arguments  #300

If I write a typed variable argument, I am expecting an argument of a specific type.
Example:

import fire

def test(some_str: str):
    print(some_str)

if __name__ == "__main__":
    fire.Fire()

Real result:

python test.py test 7.30
7.3

Expected Result:

python test.py test 7.30
7.30

So this feature will not break argument parsing. The typed argument should be enough to detect the real type.