2.4.13.2 number
An Error instance only initially has a number property if it is created by the JScript 5.x implementation in response to the occurrence of a runtime error. The initial value of number is the number value passed to the constructor.
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An Error instance only initially has a number property if it is created by the JScript 5.x implementation in response to the occurrence of a runtime error. The initial value of number is the number value passed to the constructor.