The new type [KeepAliveConfig] permits fine-tuning the keep-alive
options for TCP connections, via a new [TCPConn.SetKeepAliveConfig]

pkg syscall (netbsd-arm64-cgo), const IP_OFFMASK = 8191
pkg syscall (netbsd-arm64-cgo), const IP_OFFMASK ideal-int
pkg syscall (netbsd-arm64-cgo), const IP_OPTIONS = 1
pkg syscall (netbsd-arm64-cgo), const IP_OPTIONS ideal-int
pkg syscall (netbsd-arm64-cgo), const IP_PORTRANGE = 19
pkg syscall (netbsd-arm64-cgo), const IP_PORTRANGE_DEFAULT = 0
pkg syscall (netbsd-arm64-cgo), const IP_PORTRANGE_DEFAULT ideal-int

pkg net/http, const MethodGet = "GET"
pkg net/http, const MethodGet ideal-string
pkg net/http, const MethodHead = "HEAD"
pkg net/http, const MethodHead ideal-string
pkg net/http, const MethodOptions = "OPTIONS"
pkg net/http, const MethodOptions ideal-string
pkg net/http, const MethodPatch = "PATCH"
pkg net/http, const MethodPatch ideal-string
pkg net/http, const MethodPost = "POST"
pkg net/http, const MethodPost ideal-string

pkg debug/elf, const DT_MIPS_LOCAL_GOTNO DynTag
pkg debug/elf, const DT_MIPS_MSYM = 1879048199
pkg debug/elf, const DT_MIPS_MSYM DynTag
pkg debug/elf, const DT_MIPS_OPTIONS = 1879048233
pkg debug/elf, const DT_MIPS_OPTIONS DynTag
pkg debug/elf, const DT_MIPS_PERF_SUFFIX = 1879048238
pkg debug/elf, const DT_MIPS_PERF_SUFFIX DynTag
pkg debug/elf, const DT_MIPS_PIXIE_INIT = 1879048227

pkg image/jpeg, func Encode(io.Writer, image.Image, *Options) error
pkg image/jpeg, method (FormatError) Error() string
pkg image/jpeg, method (UnsupportedError) Error() string
pkg image/jpeg, type FormatError string
pkg image/jpeg, type Options struct
pkg image/jpeg, type Options struct, Quality int
pkg image/jpeg, type Reader interface { Read, ReadByte }

pkg syscall (freebsd-arm64), const IP_ONESBCAST = 23
pkg syscall (freebsd-arm64), const IP_ONESBCAST ideal-int
pkg syscall (freebsd-arm64), const IP_OPTIONS = 1
pkg syscall (freebsd-arm64), const IP_OPTIONS ideal-int
pkg syscall (freebsd-arm64), const IP_PORTRANGE = 19
pkg syscall (freebsd-arm64), const IP_PORTRANGE ideal-int
pkg syscall (freebsd-arm64), const IP_PORTRANGE_DEFAULT = 0

### Go 1.21

Go 1.21 made it a run-time error to call `panic` with a nil interface value,
controlled by the [`panicnil` setting](/pkg/builtin/#panic).

Go 1.21 made it an error for html/template actions to appear inside of an ECMAScript 6
template literal, controlled by the
[`jstmpllitinterp` setting](/pkg/html/template#hdr-Security_Model).
This behavior was backported to Go 1.19.8+ and Go 1.20.3+.

pkg crypto/ed25519, func VerifyWithOptions(PublicKey, []uint8, []uint8, *Options) error #31804
pkg crypto/ed25519, method (*Options) HashFunc() crypto.Hash #31804
pkg crypto/ed25519, type Options struct #31804
pkg crypto/ed25519, type Options struct, Context string #31804
pkg crypto/ed25519, type Options struct, Hash crypto.Hash #31804
pkg crypto/rsa, type OAEPOptions struct, MGFHash crypto.Hash #19974

pkg net/http/cookiejar, func New(*Options) (*Jar, error)
pkg net/http/cookiejar, method (*Jar) Cookies(*url.URL) []*http.Cookie
pkg net/http/cookiejar, method (*Jar) SetCookies(*url.URL, []*http.Cookie)
pkg net/http/cookiejar, type Jar struct
pkg net/http/cookiejar, type Options struct
pkg net/http/cookiejar, type Options struct, PublicSuffixList PublicSuffixList

pkg image/draw, var FloydSteinberg Drawer
pkg image/gif, func Encode(io.Writer, image.Image, *Options) error
pkg image/gif, func EncodeAll(io.Writer, *GIF) error
pkg image/gif, type Options struct
pkg image/gif, type Options struct, Drawer draw.Drawer
pkg image/gif, type Options struct, NumColors int
pkg image/gif, type Options struct, Quantizer draw.Quantizer
pkg log/syslog (freebsd-386-cgo), const LOG_ALERT Priority