What's Changed

• Fix tests assuming that the temporary directory doesn't include symlinks by @tristanlabelle in https://github.com/apple/swift-corelibs-foundation/pull/4723
• Fix typo in doc comment by @valeriyvan in https://github.com/apple/swift-corelibs-foundation/pull/4716
• JSONDecoder.readString(): throw on invalid UTF-8 by @ruihe774 in https://github.com/apple/swift-corelibs-foundation/pull/4675
• Foundation/Unit: add {m,u,p,n}second units to UnitDuration by @AndrewSB in https://github.com/apple/swift-corelibs-foundation/pull/4708
• Use macOS instead of OSX by @AtariDreams in https://github.com/apple/swift-corelibs-foundation/pull/4640
• waitUntilExit: ignore RunLoop.run()'s return value by @fischman-bcny in https://github.com/apple/swift-corelibs-foundation/pull/4740
• Foundation: implement Bundle.init(for:) on Windows by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4744
• Move the size check to be the first thing checked in CFAllocator functions by @AtariDreams in https://github.com/apple/swift-corelibs-foundation/pull/4641
• Foundation: add some type conversion extensions for Windows by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4747
• Foundation: support file system representation for long paths by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4746
• Foundation: simplify handler handling by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4751
• Tests: correct spelling of /dev/null on Windows by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4753
• Foundation: correct directory iteration on Windows by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4745
• Foundation: avoid unnecessary disk IO on windows file enumeration by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4748
• Windows long paths support by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4750
• Do not chdir before calling posix_spawn by @Lukasa in https://github.com/apple/swift-corelibs-foundation/pull/4606
• Revert "Do not chdir before calling posix_spawn" by @shahmishal in https://github.com/apple/swift-corelibs-foundation/pull/4764
• Windows: extend some type conversion definitions by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4766
• Foundation: support long file paths for FileHandle on Windows by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4768
• Fix available attributes by @woxtu in https://github.com/apple/swift-corelibs-foundation/pull/4770
• Foundation: Windows long file support in FileManager.createDirectory by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4771
• Foundation: adjust _fileExists for NT style paths by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4773
• Fix a concurrency bug in the TestFileHandle.test_readToEndOfFileAndNotify() unit test. by @grynspan in https://github.com/apple/swift-corelibs-foundation/pull/4787
• Add Sendable to Date, DateComponents and Data by @FranzBusch in https://github.com/apple/swift-corelibs-foundation/pull/4777
• Foundation: unmask Windows events on the main RunLoop by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4759
• Foundation: adjust moveFile to support long paths on Windows by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4784
• Foundation: use NT-style paths for CopyFileW by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4793
• Foundation: improve relative path computation for iteration on Windows by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4797
• Remove an invalid file reference by @woxtu in https://github.com/apple/swift-corelibs-foundation/pull/4796
• Fix UserDefaults.string(forKey:) behavior by @woxtu in https://github.com/apple/swift-corelibs-foundation/pull/4780
• Fix UserDefaults.integer(forKey:) behavior by @woxtu in https://github.com/apple/swift-corelibs-foundation/pull/4781
• Foundation: make _moveItem resilient to multiple volumes by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4800
• Fix UserDefaults.float(forKey:) behavior by @woxtu in https://github.com/apple/swift-corelibs-foundation/pull/4782
• Foundation: adjust _NSCleanupTemporaryFile on Windows by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4801
• Foundation: alter NSData.contents(of:options:) on Windows by @compnerd in https://github.com/apple/swift-corelibs-foundation/pull/4802
• Fix UserDefaults.double(forKey:) behavior by @woxtu in https://github.com/apple/swift-corelibs-foundation/pull/4783
• Fix the way known locations are generated on windows by @darinf in https://github.com/apple/swift-corelibs-foundation/pull/4805
• Fix JSONDecoder.decode(_,from:) behavior by @ypli-chn in https://github.com/apple/swift-corelibs-foundation/pull/4807
• Cherry pick #4827 by @FranzBusch in https://github.com/apple/swift-corelibs-foundation/pull/4829
• [5.10] Cherry-pick Fix divergent overwrite behavior of FileManager.copyItem(at:to:) on Linux and Windows by @gwynne in https://github.com/apple/swift-corelibs-foundation/pull/4825
• [5.10] Cherry-pick Ensure URLSession and curl agree on the host #4836 by @jrflat in https://github.com/apple/swift-corelibs-foundation/pull/4853

New Contributors

• @ruihe774 made their first contribution in https://github.com/apple/swift-corelibs-foundation/pull/4675
• @AndrewSB made their first contribution in https://github.com/apple/swift-corelibs-foundation/pull/4708
• @fischman-bcny made their first contribution in https://github.com/apple/swift-corelibs-foundation/pull/4740
• @darinf made their first contribution in https://github.com/apple/swift-corelibs-foundation/pull/4805
• @ypli-chn made their first contribution in https://github.com/apple/swift-corelibs-foundation/pull/4807

Full Changelog: https://github.com/apple/swift-corelibs-foundation/compare/swift-5.9.2-RELEASE...swift-5.10-RELEASE