我知道抽象比较会将 LHS 转换为 StringString([null, undefined, []])并将结果为',,'.
String([null, undefined, []])
',,'
但是String(null)是'null'并且String(undefined)是'undefined'。因此，如何String([null, undefined, []])是',,'？
String(null)
'null'
String(undefined)
'undefined'
javascript arrays coercion comparison-operators
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