You could validate a BIC and IBAN against each other, is it still possible when using different options on BIC and IBAN?

Tests certainly failed due to merge in twig repo, maybe twigphp/Twig#2848 ?

I've been checking the case-sensitivity details for BIC and IBAN, which is surprisingly hard to find:

1. IBAN: 2 uppercase letters for the country + 2 digits + up to 30 alphanumeric characters for the bank account number. The last 30-character part is case-insensitive: https://en.wikipedia.org/wiki/International_Bank_Account_Number
2. BIC: it's not clear. The standard doesn't mention it: https://www.swift.com/standards/data-standards/bic#BICvalidationUserGuide but all validator you can find in other languages assume that it's case-sensitive and only uppercase letters are accepted. This (big) PDF contains the full list of all valid BIC codes in the world. All of them are uppercase: https://www.iso9362.org/documents/ISOBIC.pdf

So, I don't think we should make the case-sensitive behavior an option. This is a BIC + IBAN validator ... we cannot change those standards to validate what we want.

So perhaps it's better to leverage #26484 in userland..

Always the same story: are validators also normalizers? If one wants to validate that it has only already normalized values in their db, then the check would be case sensitive and it should fail on whitespaces. Now, if one wants to accept user input and be robust (following the robustness principle), then the validator should accept both spaces and lowercase letters, and normalize them to uppercase+spaceless.

Both approaches are valid. Which domain is covered by this class?

A validator should only validate the official way. So, adding options to deviate from that is a no go to me.

Thank you @alamirault
I'm going to close as explained.
On my side, I think we should make a clear distinction when the validator is in "strict" vs "filtering" mode.
That should be a concept that applies to almost all validators. (strict means the input is exactly the same as the output, after normalization)