Any value of comparable type may be canonicalized with the new
`Make[T]` function, which produces a reference to a canonical copy of
the value in the form of a `Handle[T]`.
Two `Handle[T]` are equal if and only if the values used to produce the
handles are equal, allowing programs to deduplicate values and reduce
their memory footprint.
Comparing two `Handle[T]` values is efficient, reducing down to a simple

pkg crypto/x509, func OIDFromInts([]uint64) (OID, error) #60665
pkg crypto/x509, method (*CertPool) AddCertWithConstraint(*Certificate, func([]*Certificate) error) #57178
pkg crypto/x509, method (OID) Equal(OID) bool #60665
pkg crypto/x509, method (OID) EqualASN1OID(asn1.ObjectIdentifier) bool #60665
pkg crypto/x509, method (OID) String() string #60665
pkg crypto/x509, type Certificate struct, Policies []OID #60665

pkg log/slog, func WarnContext(context.Context, string, ...interface{})  #61200
pkg log/slog, func Warn(string, ...interface{}) #56345
pkg log/slog, func With(...interface{}) *Logger #56345
pkg log/slog, method (Attr) Equal(Attr) bool #56345
pkg log/slog, method (Attr) String() string #56345
pkg log/slog, method (*JSONHandler) Enabled(context.Context, Level) bool #56345
pkg log/slog, method (*JSONHandler) Handle(context.Context, Record) error #56345