mastercard fix#72
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Titolo:
fix: validazione corretta delle carte Mastercard 2-series
Descrizione:
La validazione delle carte Mastercard non riconosceva correttamente le carte
moderne della serie "2".
Il range ufficiale di queste carte va da 2221 a 2720, ma il controllo era
approssimativo: rifiutava carte valide (es. quelle che iniziano con 2700–2720)
e accettava prefissi che non sono Mastercard (es. 2200–2220 e 2721 in su).
Ora il range 2221–2720 viene riconosciuto in modo esatto: le carte valide
vengono accettate e quelle fuori range correttamente rifiutate. Le carte
Mastercard "vecchie" (51–55) continuano a funzionare come prima.
Aggiunti test per i casi limite e per l'intero range.