jsCurrencyDisplayName() was hardcoding 'en' for Intl.DisplayNames,
so every currency name shown on web (USD, JPY, ...) stayed English
regardless of the user's locale — same class of bug as the "EU"
string, just for every currency rather than one region. Switched to
undefined, matching regionDisplayName()'s fix; verified with Node
that this actually produces locale-appropriate names (e.g. "US
Dollar" / "dollar des États-Unis" / "米ドル").
Left jsCurrencyFractionDigits()'s 'en' alone and documented why:
verified with Node that a currency's decimal-digit count doesn't
vary by locale, so locale there is just a required constructor
argument, not something the result depends on.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FXcrACM5sok3M1KQJ8kByy
tyiuandClaude Sonnet 5
f7fdb2b823