The previous WITHDRAWN_CURRENCY_CODES exclusion list only covered the
5 retired codes I'd found by diffing against the JVM — but which
codes Intl.supportedValuesOf('currency') returns is ICU-version-
dependent, and apparently some browsers' ICU data includes currencies
retired decades ago (AFA, ALK, AOK, AON, AOR, and evidently more)
alongside current ones. An exclusion list can't keep up with an
unbounded, browser-dependent set of historical codes.
Replaced with ACTIVE_CURRENCY_CODES, an allowlist taken directly from
the JVM's own live-derived "currently used" set (verified against a
real JVM run, 155 codes) plus PRECIOUS_METAL_CURRENCY_CODES. This
naturally excludes every retired code regardless of what a given
browser's Intl data happens to expose, rather than needing to know
about each one in advance.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FXcrACM5sok3M1KQJ8kByy
tyiuandClaude Sonnet 5
9ba812c82d