<commit_before><commit_msg>Add test that verifies ExternalData can be only top-level<commit_after>[
	{
		"type": "ExternalData",
		"service": "geoshape",
		"query": "foo"
	},
	{
		"type": "FeatureCollection",
		"features": [
			{
				"type": "ExternalData",
				"service": "geoshape",
				"query": "foo"
			}
		]
	}
]
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