CLDR appends a "(1927–2002)" or "(2009–2024)" style validity-period
suffix to a historical/superseded currency's display name — a
broader, data-driven signal than the hand-maintained
WITHDRAWN_CURRENCY_CODES list, catching ones not added there yet
(confirmed AFA, ALK, AOK, AON, AOR, ROL, TRL, RUR, and others all get
this treatment). Not a full replacement for the list though: some
withdrawn currencies (pre-euro ones especially, e.g. "German Mark"
for DEM) carry no such hint in every ICU dataset.
Verified with Node against the real Intl.DisplayNames output: matches
every year-annotated name actually observed, and produces zero false
positives across all 162 currently-formattable codes (Node's
Intl.supportedValuesOf('currency') set) — the only two matches were
SLL and ZWL, which are already known-withdrawn.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FXcrACM5sok3M1KQJ8kByy
tyiuandClaude Sonnet 5
9a064b55d9