[swift-evolution] Pitch: URL(fileURLWithPath:) to URL(filePath:)

[Georgios Moschovitis]

> Right. We’ll have some limited ability to do source breaking changes in Swift 4, but we need to figure out how the mitigation strategy will work (in full detail) so we know exactly what sort of changes will work.

What about having additional source-breaking changes (like the one pitched here) in Swift 3.x versions?