There are a few strings that are treated differently by Int conversions vs Float conversions. It's probably as simple as different teams worked on the two pieces of code, and had some slight difference in the way they dealt with non-numeric ASCII characters.
I have to ask, why would you want to convert a hyphen to a number of either sort? They Int conversion is probably treating that as if it were "negative 0", which is the same as "zero", mathematically. But why bother with that piece of code?
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