[swift-evolution] [Review] SE-0187: Introduce Sequence.filterMap(_:)

[Tino Heth]

-1

I guess breaking existing code will be the show stopper for this proposal — but I generally think that compatibility is a poor rationale to stop an improvement, so my personal reasons are different:
The name is just wrong.
Just have a look at this simple example

extension Int {
    func justImagineError() throws -> Int {
        return self
    }
}

let ints: [Int?] = [nil]

let result = ints.flatMap {
    return try? $0?.justImagineError()
}
print(result)

If flatMap would really filter out nil values, this should yield an empty array as result — but the actual output is [nil]
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