これは知りませんでした...
let a = -1 * 0
console.log(a) // -0
console.log(Math.max(a)) // -0
console.log(parseInt(Math.max(a))) // 0
いくつか参考URLを貼っておきます
Why JavaScript has two zeros: -0 and +0
Are +0 and -0 the same?
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