[yu2971512385-ui]

config/currency_iso.json holds eight codes that ISO 4217 has withdrawn, while config/currency_backwards_compatible.json exists for exactly that. Checked against ISO 4217 list three (the historical list, published 2026-01-01):

code	withdrawn		successor, already present
SKK	2009-01	Slovak Koruna	EUR
ZMK	2012-12	Zambian Kwacha	ZMW
BYR	2017-01	Belarusian Ruble	BYN
STD	2017-12	São Tomé and Príncipe Dobra	STN
CUC	2021-06	Cuban Convertible Peso	CUP
SLL	2023-12	Sierra Leonean Leone	SLE
ANG	2025-03	Netherlands Antillean Guilder	XCG
BGN	2026-01	Bulgarian Lev	EUR

BGN is this January's — Bulgaria adopted the euro.

The part that is visible

BYR also carries "priority": 50. Only seven currencies in the file have a priority below 100, and the other six are the majors, so a currency withdrawn in 2017 comes seventh in Money::Currency.all, ahead of every currency still in use:

before:  USD(1) EUR(2) GBP(3) AUD(4) CAD(5) JPY(6) BYR(50) SLL(100)
after:   USD(1) EUR(2) GBP(3) AUD(4) CAD(5) JPY(6) TWD(100) TTD(100)

Anything that builds a currency picker from .all has been offering the pre-2016 Belarusian ruble in seventh place. Every entry already in currency_backwards_compatible.json sits at 100, so this drops BYR to match them.

Nothing stops resolving

Loader.load_currencies merges all three files, so moving an entry between them changes no lookup. Verified on the merged table:

before.size == after.size        # 196
before.keys - after.keys         # []        nothing lost
before.keys.select { |k| before[k] != after[k] }
                                 # ["byr"]   priority 50 -> 100, the fix itself

Money::Currency.new(:skk), .find("ANG") and find_by_iso_numeric all behave as before. The one thing that does shift is the iteration order of the merged hash, and with it the order of equal-priority entries in .all — but .all uses sort_by(&:priority), which is not a stable sort, so that order was never defined to begin with.

Testing

Added one case to the existing .all block, which fails on master and passes here:

bundle exec rspec spec/money/currency_spec.rb
  with the spec added and the data untouched:  56 examples, 1 failure
  with the data corrected:                     56 examples, 0 failures

bundle exec rspec
  503 examples, 0 failures

CHANGELOG and AUTHORS updated per CONTRIBUTING.

I left currency_iso.json alone otherwise. It also lacks VED and XAD, which are current in list one, but it deliberately omits the funds codes (BOV, CHE, CHW, COU, MXV, USN, UYI, UYW) and the units of account XSU and XUA, so where that boundary sits is your call rather than a bug.

Disclosure: written with AI assistance (Claude). The withdrawal dates come from ISO 4217 list three via SIX Group, and every figure above is real output from this branch.

🤖 Generated with Claude Code

[sunny]

Hi there. You have included way too much code in this patch by adding the vendor folder 😱