No Validate option code is wrong - and patch

The widget setting to Not Validate does not work. The reason is this line of code that checks if validation should be done or not:

having the !-- check not just logic but data type as well... and the field setting comes in as a string '0', '1' or '2'.. whereas the constant is a long int.. so this fails all the time

correct code should be

$field['isbn_validation'] != ISBN_NO_VALIDATION

patch is attached