Okay so a few days ago there was a discussion <https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20170814/038923.html> about getting pure swift file system support into Foundation or another core library, and in my opinion, doing this requires a total overhaul of the `URL` type (which is currently little more than a wrapper for NSURL), so I’ve just started a pure Swift URL library project at < https://github.com/kelvin13/url>.
The library’s parsing and validation core (~1K loc pure swift) is already in place and functional; the goal is to eventually support all of the Foundation URL functionality. The new `URL` type is implemented as a value type with utf8 storage backed by an array buffer. The URLs are just 56 bytes long each, so they should be able to fit into cache lines. (NSURL by comparison is over 128 bytes in size; it’s only saved by the fact that the thing is passed as a reference type.) As I said, this is still really early on and not a mature library at all but everyone is invited to observe, provide feedback, or contribute!
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