URLSearchParamsがカンマをエンコードする
code:searchparams.js
console.log(u.searchParams.get('t')); // => 1,2
console.log(u.searchParams.toString()); // => t=1%2C2
u.searchParams.set('t', '1,2');
console.log(u.searchParams.get('t')); // => 1,2
console.log(u.searchParams.toString()); // => t=1%2C2
console.log(u1 == u2); // => false
console.log(u1.searchParams.get('t')); // => 1,2
console.log(u2.searchParams.get('t')); // => 1,2
console.log(u1.searchParams.get('t') == u2.searchParams.get('t')); // => true
console.log(u1.searchParams.toString() == u2.searchParams.toString()); // => true