remove the 128 character limit for validation rules

hi there,

today I've be wrestling around with the database induced cap of 128 characters for (in my case a regex regarding phone numbers) validations.

though I didn't spend much time on this case, my guess is that it's because of line number 68 & 69 in field_validation.install. I would suggest to change that to either something bigger (bad idea) or to change the type to text (big) and thereby remove the trouble of ever* having to think about that another time.

greets,

attisan

*well, ... mostly