feat(isISO31661Numeric): Add validation for ISO 3166-1 numeric country codes #2399
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The ISO 3166-1 standard contains three sets of country codes: two-letter, three-letter, and three-digit. Currently, we have a validator for two-letter codes (
isISO31661Alpha2) and three-letter codes (isISO31661Alpha3), but not for three-digit codes. This pull request addresses that.References
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