commit 677ee2634952e762ca57ffcb8fffee91692c7517
Author: André Bargull <andre.bargull@gmail.com>
Date:   Thu Jan 29 14:19:46 2026 +0100

    Allow Intl.DisplayNames to support calendars not returned by Intl.supportedValuesOf
    
    Change the assertion so that if a calendar is not supported, then it
    must be a calendar not returned by `Intl.supportedValuesOf("calendar")`.
    
    This allows for example implementations to provide a display name for
    `"islamic"`.
    
    See <https://github.com/tc39/ecma402/issues/1042>.