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Normative: Allow Locale.p.getNumberingSystems to return >1 item #1074

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Normative: Allow Locale.p.getNumberingSystems to return >1 item #1074

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Normative: Allow Locale.p.getNumberingSystems to return >1 item
ptomato Jun 3, 2026
c1997e3
(fixup) Handle LocaleData.[[nu]] containing irrelevant numbering systems
ptomato Sep 1, 2026
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9 changes: 7 additions & 2 deletions spec/locale.html
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Original file line number Diff line number Diff line change
Expand Up @@ -719,8 +719,13 @@ <h1>
1. If _match_ is not *undefined*, then
1. Let _foundLocale_ be _match_.[[locale]].
1. Let _foundLocaleData_ be %Intl.NumberFormat%.[[LocaleData]].[[&lt;_foundLocale_&gt;]].
1. Let _numberingSystems_ be _foundLocaleData_.[[nu]].
1. Let _list_ be « _numberingSystems_[0] ».
1. Let _supportedNumberingSystems_ be _foundLocaleData_.[[nu]].
1. Let _numberingSystemsInUse_ be a List of unique numbering system identifiers in common use for formatting numeric values in locale _foundLocale_, sorted by descending preference of use in _foundLocale_.
1. Let _list_ be a new empty List.
1. For each element _identifier_ of _numberingSystemsInUse_, do
1. If _supportedNumberingSystems_ contains _identifier_, then
1. Append _identifier_ to _list_.
1. Assert: _list_[0] is _supportedNumberingSystems_[0].
1. Else,
1. Let _list_ be « *"latn"* ».
1. Return CreateArrayFromList(_list_).
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