pkg runtime/debug, type BuildSetting struct
pkg runtime/debug, type BuildSetting struct, Key string
pkg runtime/debug, type BuildSetting struct, Value string
pkg strings, func Clone(string) string
pkg strings, func Cut(string, string) (string, string, bool)
pkg strings, func Title //deprecated
pkg sync, method (*Mutex) TryLock() bool
pkg sync, method (*RWMutex) TryLock() bool

This setting will be removed in a future release, Go 1.22 at the earliest.

### Go 1.10

Go 1.10 changed how build caching worked and added test caching, along
with the [`gocacheverify`, `gocachehash`, and `gocachetest` settings](/cmd/go/#hdr-Build_and_test_caching).
There is no plan to remove these settings.

### Go 1.6

Go 1.6 introduced transparent support for HTTP/2,

pkg p4, method (Pair[$0, $1]) Second() $1
pkg p4, method (Pair[$0, $1]) First() $0
pkg p4, type Pair[$0 interface{ M }, $1 interface{ ~int }] struct
pkg p4, func Clone[$0 interface{ ~[]$1 }, $1 interface{}]($0) $0

pkg log/slog, method (*Record) AddAttrs(...Attr) #56345
pkg log/slog, method (*Record) Add(...interface{}) #56345
pkg log/slog, method (Record) Attrs(func(Attr) bool) #59060
pkg log/slog, method (Record) Clone() Record #56345
pkg log/slog, method (Record) NumAttrs() int #56345
pkg log/slog, method (*TextHandler) Enabled(context.Context, Level) bool #56345
pkg log/slog, method (*TextHandler) Handle(context.Context, Record) error #56345

pkg crypto/x509, func ParseRevocationList([]uint8) (*RevocationList, error) #50674
pkg crypto/x509, method (*CertPool) Clone() *CertPool #35044
pkg crypto/x509, method (*CertPool) Equal(*CertPool) bool #46057
pkg crypto/x509, method (*RevocationList) CheckSignatureFrom(*Certificate) error #50674
pkg crypto/x509, type RevocationList struct, AuthorityKeyId []uint8 #50674
pkg crypto/x509, type RevocationList struct, Extensions []pkix.Extension #50674