Normative: Explicitly designate the (non-lexicographic) sort order for (#918)

Strings in _pluralCategories_ List in
Intl.PluralRules.prototype.resolvedOptions()

Author: ben-allen

spec/pluralrules.html

@@ -159,7 +159,7 @@ <h1>Intl.PluralRules.prototype.resolvedOptions ( )</h1>
         1. Let _pr_ be the *this* value.
         1. Perform ? RequireInternalSlot(_pr_, [[InitializedPluralRules]]).
         1. Let _options_ be OrdinaryObjectCreate(%Object.prototype%).
-        1. Let _pluralCategories_ be a List of Strings containing all possible results of <emu-xref href="#sec-pluralruleselect">PluralRuleSelect</emu-xref> for the selected locale _pr_.[[Locale]].
+        1. Let _pluralCategories_ be a List of Strings containing all possible results of <emu-xref href="#sec-pluralruleselect">PluralRuleSelect</emu-xref> for the selected locale _pr_.[[Locale]], sorted according to the following order: *"zero"*, *"one"*, *"two"*, *"few"*, *"many"*, *"other"*.
         1. For each row of <emu-xref href="#table-pluralrules-resolvedoptions-properties"></emu-xref>, except the header row, in table order, do
           1. Let _p_ be the Property value of the current row.
           1. If _p_ is *"pluralCategories"*, then