[swift-users] ?? operator question

[tuuranton at tutanota.de]

Why does this compile?
let t1: Int? = 2print(t1 ?? "asdf")
The type of ?? is this:
@warn_unused_resultpublic func ??<T>(optional: T?, @autoclosure defaultValue: 
() throws -> T) rethrows -> T
The type syas that T must be the same type throughout. But above I could 
successfully use Int? and then String. Why?
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