pkg math/big, type RoundingMode uint8
pkg mime, const BEncoding = 98
pkg mime, const BEncoding WordEncoder
pkg mime, const QEncoding = 113
pkg mime, const QEncoding WordEncoder
pkg mime, func ExtensionsByType(string) ([]string, error)
pkg mime, method (*WordDecoder) Decode(string) (string, error)
pkg mime, method (*WordDecoder) DecodeHeader(string) (string, error)
pkg mime, method (WordEncoder) Encode(string, string) string

pkg math/bits, func TrailingZeros32(uint32) int
pkg math/bits, func TrailingZeros64(uint64) int
pkg math/bits, func TrailingZeros8(uint8) int
pkg mime, var ErrInvalidMediaParameter error
pkg mime/multipart, type FileHeader struct, Size int64
pkg mime/multipart, var ErrMessageTooLarge error
pkg net, method (*IPConn) SyscallConn() (syscall.RawConn, error)
pkg net, method (*TCPConn) SyscallConn() (syscall.RawConn, error)

### Go 1.23

Go 1.23 changed the channels created by package time to be unbuffered
(synchronous), which makes correct use of the [`Timer.Stop`](/pkg/time/#Timer.Stop)
and [`Timer.Reset`](/pkg/time/#Timer.Reset) method results much easier.
The [`asynctimerchan` setting](/pkg/time/#NewTimer) disables this change.
There are no runtime metrics for this change,

pkg time, func NewTimer(Duration) *Timer
pkg time, func Now() Time
pkg time, func Parse(string, string) (Time, error)
pkg time, func ParseDuration(string) (Duration, error)
pkg time, func Since(Time) Duration
pkg time, func Sleep(Duration)
pkg time, func Tick(Duration) <-chan Time
pkg time, func Unix(int64, int64) Time
pkg time, method (*Location) String() string

pkg net/http, type Client struct, Timeout time.Duration
pkg net/http, type ConnState int
pkg net/http, type Response struct, TLS *tls.ConnectionState
pkg net/http, type Server struct, ConnState func(net.Conn, ConnState)
pkg net/http, type Server struct, ErrorLog *log.Logger
pkg net/http, type Transport struct, TLSHandshakeTimeout time.Duration
pkg regexp/syntax, method (*Inst) MatchRunePos(int32) int

pkg database/sql, type NullInt32 struct
pkg database/sql, type NullInt32 struct, Int32 int32
pkg database/sql, type NullInt32 struct, Valid bool
pkg database/sql, type NullTime struct
pkg database/sql, type NullTime struct, Time time.Time
pkg database/sql, type NullTime struct, Valid bool
pkg debug/dwarf, method (*UnsupportedType) Common() *CommonType
pkg debug/dwarf, method (*UnsupportedType) Size() int64

pkg math, func FMA(float64, float64, float64) float64
pkg math/bits, func Rem(uint, uint, uint) uint
pkg math/bits, func Rem32(uint32, uint32, uint32) uint32
pkg math/bits, func Rem64(uint64, uint64, uint64) uint64
pkg mime/multipart, method (*Reader) NextRawPart() (*Part, error)
pkg net/http, method (Header) Values(string) []string
pkg net/http, type Transport struct, DialTLSContext func(context.Context, string, string) (net.Conn, error)

### Timer changes

Go 1.23 makes two significant changes to the implementation of
[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.

pkg archive/tar, type FileInfoNames interface, Gname() (string, error) #50102
pkg archive/tar, type FileInfoNames interface, IsDir() bool #50102
pkg archive/tar, type FileInfoNames interface, ModTime() time.Time #50102
pkg archive/tar, type FileInfoNames interface, Mode() fs.FileMode #50102
pkg archive/tar, type FileInfoNames interface, Name() string #50102
pkg archive/tar, type FileInfoNames interface, Size() int64 #50102

pkg net, type KeepAliveConfig struct #62254
pkg net, type KeepAliveConfig struct, Count int #62254
pkg net, type KeepAliveConfig struct, Enable bool #62254
pkg net, type KeepAliveConfig struct, Idle time.Duration #62254
pkg net, type KeepAliveConfig struct, Interval time.Duration #62254
pkg net, type ListenConfig struct, KeepAliveConfig KeepAliveConfig #62254
pkg syscall (windows-386), const WSAENOPROTOOPT = 10042 #62254