Go 1.24 added new values for the `multipathtcp` setting.
The possible values for `multipathtcp` are now:
- "0": disable MPTCP on dialers and listeners by default
- "1": enable MPTCP on dialers and listeners by default
- "2": enable MPTCP on listeners only by default
- "3": enable MPTCP on dialers only by default

For Go 1.24, it now defaults to multipathtcp="2", thus

pkg net/http, var ErrSchemeMismatch error #44855
pkg net, method (*Dialer) MultipathTCP() bool #56539
pkg net, method (*Dialer) SetMultipathTCP(bool) #56539
pkg net, method (*ListenConfig) MultipathTCP() bool #56539
pkg net, method (*ListenConfig) SetMultipathTCP(bool) #56539
pkg net, method (*TCPConn) MultipathTCP() (bool, error) #59166
pkg reflect, method (Value) Clear() #55002