I should not attempt the perfect stairway to the top of each mountain.  Get to the top, then build a staircase if time allows.

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Python Dynamic Type System idea

    @constrain(name=str, value=int_between_0_and_100)
    def foo(name, value):
        pass


    def foo(name, value):
        """    
        Where:
            - name (unicode)
            - value (int): > 0, < 100
        """

    @alt(foo)
    def foo(name, coef):
        """
        Where:
            - name (str)
            - value (float): > 0
        """