[Validator] Allow BICs’ first four characters to be digits #54219
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While a lot of sources claim a BIC’s first four characters must be letters, this is not the case since ISO 9362:1994. The confusion may come from SWIFT (ISO 9362’s registration authority) saying that
Source (clicking this link will trigger a download)
However, the next paragraph says
As @luxemate stumbled on such a valid BIC (see linked issue), this PR removes the
Bic::INVALID_BANK_CODE_ERROR
check. This constant won’t be referenced anymore so it may be deprecated and removed later.