2.1.12 [ECMA-262/5] Section, Number.prototype.toExponential (fractionDigits)


The specification states:

 An implementation is permitted to extend the behaviour of toExponential for values of fractionDigits less than 0 or greater than 20. In this case toExponential would not necessarily throw RangeError for such values.

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If any value of the fractionDigits function is converted to an integer and it is equal to +∞ or -∞, this value is treated as if it is the value 0.