[Cookie] now preserves double quotes surrounding a cookie value.
The new [Cookie.Quoted] field indicates whether the [Cookie.Value]

The [SliceAt(typ Type, p unsafe.Pointer, len int)] function
returns a Value representing a slice whose underlying array starts

pkg unique, func Make[$0 comparable]($0) Handle[$0] #62483
pkg unique, method (Handle[$0]) Value() $0 #62483

behavior has changed based on a non-default value
for that setting.
For example, when `GODEBUG=http2client=0` is set,
`/godebug/non-default-behavior/http2client:events`
counts the number of HTTP transports that the program
has configured without HTTP/2 support.

## Default GODEBUG Values {#default}

When a GODEBUG setting is not listed in the environment variable,
its value is derived from three sources:

### New unique package

The new [unique](/pkg/unique) package provides facilities for
canonicalizing values (like "interning" or "hash-consing").

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

The [RuneLen] function returns the number of 16-bit words in
the UTF-16 encoding of the rune. It returns -1 if the rune

The new [ParseCookie] function parses a Cookie header value and
returns all the cookies which were set in it. Since the same cookie
name can appear multiple times the returned Values can contain
more than one value for a given key.

The new [ParseSetCookie] function parses a Set-Cookie header value and

The new methods synonymous with the method of the same name
in [Value] are added to [Type]:
1. [Type.OverflowComplex]
2. [Type.OverflowFloat]
3. [Type.OverflowInt]

pkg crypto/x509, type Certificate struct, Policies []OID #60665
pkg crypto/x509, type OID struct #60665
pkg database/sql, method (*Null[$0]) Scan(interface{}) error #60370
pkg database/sql, method (Null[$0]) Value() (driver.Value, error) #60370
pkg database/sql, type Null[$0 interface{}] struct #60370
pkg database/sql, type Null[$0 interface{}] struct, V $0 #60370
pkg database/sql, type Null[$0 interface{}] struct, Valid bool #60370

pkg log/slog, method (Value) Any() interface{} #56345
pkg log/slog, method (Value) Bool() bool #56345
pkg log/slog, method (Value) Duration() time.Duration #56345
pkg log/slog, method (Value) Equal(Value) bool #56345
pkg log/slog, method (Value) Float64() float64 #56345
pkg log/slog, method (Value) Group() []Attr #56345
pkg log/slog, method (Value) Int64() int64 #56345