a suggestion for `minSize` operator enhancement

Describe the feature you request

When setting a collection with fixture monkey operator minSize, then I expect it to be NOT null.

For example, it would be nice to have tearchers which is always NOT null in the below circumstance. The rational behind this is that if the size of a collection is greater than 0, the collection should not be null.

fun school(fixture: FixtureMonkey): ArbitraryBuilder<School> = 
  fixture.giveMeBuilder(School::class.java)
    .minSize("teachers", 1)

data class School() {
  val teachers: List<Teacher>
}

If the feature request is approved, would you be willing to submit a PR?

Yes

Start at the Fixture Monkey minSize operator and trace how it applies constraints to collection properties. Use the School example with minSize("teachers", 1) to verify the resulting teachers collection is both non-null and has at least one element; done means this behavior is covered by tests.