- x.valueOf()
- x.valueOf.call(undefined)
- TypeError: Object.prototype.valueOf: 'this' is null or undefined
- x.valueOf.call(null)
- TypeError: Object.prototype.valueOf: 'this' is null or undefined
- x.valueOf.call()
- TypeError: Object.prototype.valueOf: 'this' is null or undefined
- typeof x.valueOf.call(true)
- object
- typeof x.valueOf.call(42)
- object
- typeof x.valueOf.call('Hello')
- object
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