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Improved BIC + IBAN validator for some special cases #29755
While blogging about Improved Financial Constraints in Symfony 4.3 I found this resource that mentions some exceptions when validating BIC + IBAN: https://wiki.xmldation.com/index.php?title=Support/EPC/IBAN_%26_BIC_relation
I don't know if that resource is fully reliable ... but I checked it in the official "European Banking Resources" website (https://www.ecbs.org/iban/) and most of it matches, so I think we can safely make this change.