/ip firewall mangle
add action=change-mss chain=forward new-mss=clamp-to-pmtu out-interface=wireguard protocol=tcp tcp-flags=syn
var a = {a:1, b:2, c:3};
var b = {a:2, b:2};
console.log(Object.assign(a,b)); // result Object {a: 2, b: 2, c: 3}
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