Extend vector so that vector may be used as a synonym for chain

[logaan]

May also apply to list. Or possibly all seqs, though would perhaps interfere with using sets for join.

[logaan]

Using sets for join could be a problem. It's possible that people care about the order that the errors appear. Like they might want them to be in the same order as the fields on the page.

If that's the case then perhaps vector should be used for join. I suspect join will be the more common use of validations.