Reverts the allowlist approach back to WITHDRAWN_CURRENCY_CODES per
request, and adds the codes actually reported: AFA, ALK, AOK, AON,
AOR, plus the full set of pre-euro legacy currencies (ATS, BEF, DEM,
FRF, ITL, ESP, GRD, PTE, NLG, IEP, and the rest), which are exactly
the kind of long-withdrawn code an ICU currency dataset would still
carry.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FXcrACM5sok3M1KQJ8kByy
tyiuandClaude Sonnet 5
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