Enhancement: set of required* rules that only focus on value, not presence

[obottek]

It would be great to have the validation rules of the required-group (required*) that omit the check for presence and simply focus on the value.

In my case I always have all the attributes, because they fall from a database table. But I want to use all those required_* rules, but they all are passed because any given field is present anyways...