Bug 171197

test262/test/built-ins/Number/prototype/toPrecision/nan.js and related Test: NaN.toPrecision(Infinity) Expected: "NaN" Actual: RangeError: toPrecision() argument must be between 1 and 21 Notes: - Order of operations here need to be refined slightly - Chrome and Firefox pass Spec: https://tc39.github.io/ecma262/#sec-number.prototype.toprecision 20.1.3.5 Number.prototype.toPrecision ( precision ) > 1. Let x be ? thisNumberValue(this value). > 2. If precision is undefined, return ! ToString(x). > 3. Let p be ? ToInteger(precision). > 4. If x is NaN, return the String "NaN". > 5. Let s be the empty String. > 6. If x < 0, then > a. Let s be code unit 0x002D (HYPHEN-MINUS). > b. Let x be -x. > 7. If x = +∞, then > a. Return the String that is the concatenation of s and "Infinity". > 8. If p < 1 or p > 21, throw a RangeError exception. However, an implementation is permitted to extend the behaviour of toPrecision for values of p less than 1 or greater than 21. In this case toPrecision would not necessarily throw RangeError for such values. > ... https://tc39.github.io/ecma262/#sec-number.prototype.toexponential 20.1.3.2 Number.prototype.toExponential ( fractionDigits ) > 1. Let x be ? thisNumberValue(this value). > 2. Let f be ? ToInteger(fractionDigits). > 3. Assert: f is 0, when fractionDigits is undefined. > 4. If x is NaN, return the String "NaN". > 5. Let s be the empty String. > 6. If x < 0, then > a. Let s be "-". > b. Let x be -x. > 7. If x = +∞, then > a. Return the concatenation of the Strings s and "Infinity". > 8. If f < 0 or f > 20, throw a RangeError exception. However, an implementation is permitted to extend the behaviour of toExponential for values of f less than 0 or greater than 20. In this case toExponential would not necessarily throw RangeError for such values. > ...