respectively.
This behavior was backported to Go 1.19.8+ and Go 1.20.3+.

Go 1.21 adds the support of Multipath TCP but it is only used if the application
explicitly asked for it. This behavior can be controlled by the
[`multipathtcp` setting](/pkg/net#Dialer.SetMultipathTCP).

There is no plan to remove any of these settings.

### Go 1.20

pkg net/netip, method (Prefix) IsValid() bool
pkg net/netip, method (Prefix) MarshalBinary() ([]uint8, error)
pkg net/netip, method (Prefix) MarshalText() ([]uint8, error)
pkg net/netip, method (Prefix) Masked() Prefix
pkg net/netip, method (Prefix) Overlaps(Prefix) bool
pkg net/netip, method (Prefix) String() string
pkg net/netip, type Addr struct
pkg net/netip, type AddrPort struct
pkg net/netip, type Prefix struct