Currently the options for isLength are min and max only.
I believe there could be more options. I'm needing the field size to be exactly 11 or 14 or 16.
For now I'm using min 11 and max 16 but in my program the length values (12, 13, 15) should not be accepted.
a new option can be:
exact: {11, 14, 16} or
size: {11, 14, 16}
Do you think this change adding more options would be a good thing?