How to overload procedure correctly?

[haxscramper]

`proc sum(a: int, b: int): int = a + b proc sum(a: int | float, b: int | 
float): float = float(a) + float(b) echo sum(1, 2) echo sum(1.0, 2) echo sum(1, 
2.0) echo sum(1.0, 2.0) `

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