SwiftNIO 2.63.0

This release includes a new module, NIOFileSystem, for asynchronously interacting with the filesystem. The module isn't yet considered public API and is therefore available via the _NIOFileSystem product. We plan to stabilise the API soon and welcome feedback in the meantime. You can learn more about NIOFileSystem by reading the documentation.

SemVer Minor

• Add async API for NonBlockingFileIO (#2576, patch credit to @adam-fowler)
• Allow setting MTELG.singleton as Swift Concurrency executor (#2564)

SemVer Patch

• Changes to support building with Musl (#2595 and #2628, patch credit to @al45tair)
• Build for Android with NDK 26, by accounting for the new nullability annotations (#2600, patch credit to @finagolfin)
• Fix warnings caused by not defining the feature macros. (#2606, patch credit to @al45tair)
• [arch] Add arm64_32 to the 32-bit platform check (#2625, patch credit to @hyerra)
• Remove precondition on result of IOCTL_VM_SOCKETS_GET_LOCAL_CID (#2588)
• Add missing availability guards in tests (#2596)
• Add NIOAsyncWriterSinkDelegate._didSuspend hook for testing (#2597)
• Suppress the performance checker warning by being sneaky (#2620)
• Avoid confstr on Android (#2627)

Other Changes

• Update APNSwift Repository Link in README.md (#2602, patch credit to @Ryu0118)
• Add tests to validate the behaviour when requests/response content-length headers are wrong in HTTP1 (#2601)
• Fix test availability annotations (#2607)
• Fix warnings when building tests on Swift 5.9.2 Linux (#2610)
• Set SWIFT_VERSION environment variable to resolve to the correct benchmarks thresholds path (#2613)
• Add cxx interop build pipeline (#2614)
• Fix the broken performance test binary (#2619)
• Fix broken tests (#2621)
• Fix NIOAsyncChannel allocation benchmarks (#2622)
• Add additional guards in tests for mocking (#2624)
• Avoid overflow in tests where Int is 32-bit (#2626)