If you're targeting modern browsers, this isn't a concern, so don't worry about it. AirBnB is just saying that if you plan on support old browsers, there are some new features such as Symbol and BigInt that when polyfilled don't have a 1:1 behavior, so you should avoid them. But if you're not planning on supporting really old browsers, then you shouldn't worry about this 😊
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If you're targeting modern browsers, this isn't a concern, so don't worry about it. AirBnB is just saying that if you plan on support old browsers, there are some new features such as Symbol and BigInt that when polyfilled don't have a 1:1 behavior, so you should avoid them. But if you're not planning on supporting really old browsers, then you shouldn't worry about this 😊