2.9.4.4 Object.prototype.lookupSetter(propertyName)
Let O be ToObject(this)
Let D be the result of calling the [[GetProperty]] internal method of O with the argument ToString(propertyName)
Return D.[[Set]]
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Let O be ToObject(this)
Let D be the result of calling the [[GetProperty]] internal method of O with the argument ToString(propertyName)
Return D.[[Set]]