Using Vim9 for a function

I'm using vim 9.1221 on Windows 10. I tried to create a function using
Vim9, as in:

def! Foo(a: float, b: float): float
  return a + b
enddef

If I call Foo(1.2, 5.0) I get the answer 6.2

but if I call Foo(1.2, 5) I get:

E1013: Argument 2:type mismatch, expected float but got number

How can I modify the function to make it possible to call Foo(1.2, 5)
and get a result.

Many thanks in advance,

--
Cesar

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