feat: ISO 4217 currency validation (it.IsCurrency)#102
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Implement Currency constraint using golang.org/x/text/currency.ParseISO, aligned with Symfony Currency. Add validate.Currency, is.Currency, ErrInvalidCurrency, translations, tests, and examples. Co-authored-by: Igor Lazarev <strider2038@yandex.ru>
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Adds Symfony-style Currency validation for ISO 4217 alphabetic codes.
Public API
it.IsCurrency()— string constraint (empty skipped; pair withit.IsNotBlank()when required).validate.Currency(string) error— returnsvalidate.ErrInvalidCurrencyon failure.is.Currency(string) bool.validation.ErrInvalidCurrency/message.InvalidCurrencywith English and Russian translations.Implementation
Codes are validated with
golang.org/x/text/currency.ParseISO(CLDR-backed set, no newgo.modentries). Letter case follows x/text rules (all upper or all lower; mixed case is rejected).Tests & docs
test/constraints_identifiers_cases_test.go.validate/currency_test.go, examples init/example_test.go,validate/example_test.go,is/example_test.go.CHANGELOG.mdunder[Unreleased]→ Added.Closes Linear IGO-33 (Currency ISO 4217).