Is there any reason why min/max value are limited to the following?
 - Min is too big (maximum is 2147483647)
I need to add ISBN numbers which are 13-digits. Is there a reason for this min/max length, and can it be increased?
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Numbers have certain limits in computer systems and storing (as well as working with) exceptionally large ones is cumbersome.
In the database, the
int (integer, a whole number) is limited to a range from -2147483648 to 2147483647. A
bigint can range from -9223372036854775808 to 9223372036854775807 but is less common. And I don't think Craft uses
I know it's purely numerical, but could your ISBN numbers use a text field? Unless you're doing math on it then this should suffice. If you really want you could a new fieldtype that validates an ISBN number but saves as a
varchar in the DB.