<https://gist.github.com/moiseev/62ffe3c91b66866fdebf6f3fcc7cad8c>
public protocol Arithmetic {
init?<T : BinaryInteger>(exactly source: T)
}
public protocol BinaryInteger : Arithmetic {
init?<T : FloatingPoint>(exactly source: T)
}
Should the `init?(exactly:)` initializers belong to the same protocol?
Would this allow generic conversions between integer and floating-point types?
For example, a failable `numericCast` function.
-- Ben
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