Editorial: Revert normative changes from #2243

Ensure inputs like `-0.5` are still throwing a RangeError instead of
being treated as `0`.

Author: anba

spec/abstractops.html

@@ -282,9 +282,9 @@ <h1>ToSecondsStringPrecision ( _normalizedOptions_ )</h1>
             [[Unit]]: *"nanosecond"*,
             [[Increment]]: 1
           }.
-      1. If _fractionalDigitsVal_ is *NaN*, throw a *RangeError* exception.
-      1. Set _fractionalDigitCount_ to ? ToIntegerThrowOnInfinity(_fractionalDigitsVal_).
-      1. If _fractionalDigitCount_ &lt; 0 or _fractionalDigitCount_ &gt; 9, throw a *RangeError* exception.
+      1. If _fractionalDigitsVal_ is *NaN*, *+&infin;*<sub>𝔽</sub>, or *-&infin;*<sub>𝔽</sub>, throw a *RangeError* exception.
+      1. If ℝ(_fractionalDigitsVal_) &lt; 0 or ℝ(_fractionalDigitsVal_) > 9, throw a *RangeError* exception.
+      1. Let _fractionalDigitCount_ be floor(ℝ(_fractionalDigitsVal_)).
       1. If _fractionalDigitCount_ is 0, then
         1. Return the Record {
             [[Precision]]: 0,