Facet by array shouldn't suggest for arrays that are not arrays-of-strings

[simonw]

It's triggering for arrays that look like this at the moment:

[
    {
        "type": "HKWorkoutEventTypeSegment",
        "date": "2019-05-21 09:43:50 -0700",
        "duration": "12.2780519704024",
        "durationUnit": "min"
    },
    {
        "type": "HKWorkoutEventTypeSegment",
        "date": "2019-05-21 09:43:50 -0700",
        "duration": "19.467273102204",
        "durationUnit": "min"
    }
]

[simonw]

I'll do this as part of #551

[simonw]

This is bothering me a lot more now - it shows up a lot with https://github.com/dogsheep databases.