As [announced](go1.22#darwin) in the Go 1.22 release notes,
Go 1.23 requires macOS 11 Big Sur or later;
support for previous versions has been discontinued.

### Wasm {#wasm}

<!-- go.dev/issue/63718 -->
The `go_wasip1_wasm_exec` script in `GOROOT/misc/wasm` has dropped support

to run apps signed by your developer certificate. Then install the libimobiledevice and
ideviceinstaller tools from https://www.libimobiledevice.org/. Use the HEAD versions from
source; the stable versions have bugs that prevents the Go exec wrapper to install and run
apps.

Second, the Go exec wrapper must be told the developer account signing identity, the team

"vendor/golang.org/x/crypto/cryptobyte". When a package with the
same path is imported from a package outside std or cmd, it will
be resolved normally. Consequently, a binary may be built with two
copies of a package at different versions if the package is
imported normally and vendored by the standard library.

Vendored packages are internally renamed with a "vendor/" prefix
to preserve the invariant that all packages have distinct paths.

[time.Timer] and [time.Ticker].

First, `Timer`s and `Ticker`s that are no longer referred to by the program
become eligible for garbage collection immediately, even if their
`Stop` methods have not been called.
Earlier versions of Go did not collect unstopped `Timer`s until after
they had fired and never collected unstopped `Ticker`s.

Second, the timer channel associated with a `Timer` or `Ticker` is
now unbuffered, with capacity 0.

Because this method of setting GODEBUG defaults was introduced only in Go 1.21,
programs listing versions of Go earlier than Go 1.20 are configured to match Go 1.20,
not the older version.

To override these defaults, a main package's source files
can include one or more `//go:debug` directives at the top of the file
(preceding the `package` statement).
Continuing the `panicnil` example, if the module or workspace is updated

For Go 1.23, it defaults to `winsymlink=1`.
Previous versions default to `winsymlink=0`.

On Windows, [EvalSymlinks] no longer tries to normalize
volumes to drive letters, which was not always even possible.
This behavior is controlled by the `winreadlinkvolume` setting.
For Go 1.23, it defaults to `winreadlinkvolume=1`.

pkg syscall (netbsd-arm64-cgo), const IPV6_V6ONLY = 27
pkg syscall (netbsd-arm64-cgo), const IPV6_VERSION = 96
pkg syscall (netbsd-arm64-cgo), const IPV6_VERSION ideal-int
pkg syscall (netbsd-arm64-cgo), const IPV6_VERSION_MASK = 240
pkg syscall (netbsd-arm64-cgo), const IPV6_VERSION_MASK ideal-int
pkg syscall (netbsd-arm64-cgo), const ISIG = 128
pkg syscall (netbsd-arm64-cgo), const ISIG ideal-int

pkg crypto/tls, type ClientSessionState struct
pkg crypto/tls, type Config struct, ClientSessionCache ClientSessionCache
pkg crypto/tls, type Config struct, CurvePreferences []CurveID
pkg crypto/tls, type ConnectionState struct, Version uint16
pkg crypto/tls, type CurveID uint16
pkg crypto/x509, func CreateCertificateRequest(io.Reader, *CertificateRequest, interface{}) ([]uint8, error)

pkg text/template, method (*Template) DefinedTemplates() string
pkg text/template, method (*Template) Option(...string) *Template
pkg time, method (Time) AppendFormat([]uint8, string) []uint8
pkg unicode, const Version = "8.0.0"
pkg unicode, var Ahom *RangeTable
pkg unicode, var Anatolian_Hieroglyphs *RangeTable
pkg unicode, var Hatran *RangeTable
pkg unicode, var Multani *RangeTable
pkg unicode, var Old_Hungarian *RangeTable

to drive letters, which was not always even possible.
This behavior is controlled by the `winreadlinkvolume` setting.
For Go 1.23, it defaults to `winreadlinkvolume=1`.