Unable to map a composite over ranges #5650

[Test]
public async Task CompositeOverRange()
{
	await using var adminConnection = await OpenConnectionAsync();
	var type = await GetTempTypeName(adminConnection);
	var rangeType = await GetTempTypeName(adminConnection);

	await adminConnection.ExecuteNonQueryAsync($"CREATE TYPE {type} AS (x int, some_text text); CREATE TYPE {rangeType} AS RANGE(subtype={type})");

	var dataSourceBuilder = CreateDataSourceBuilder();
	dataSourceBuilder.MapComposite<SomeComposite>(type);
	dataSourceBuilder.EnableUnmappedTypes();
	await using var dataSource = dataSourceBuilder.Build();
	await using var connection = await dataSource.OpenConnectionAsync();

	var composite1 = new SomeComposite
	{
		SomeText = "foo",
		X = 8
	};

	var composite2 = new SomeComposite
	{
		SomeText = "bar",
		X = 42
	};

	await AssertType(
		connection,
		new NpgsqlRange<SomeComposite>(composite1, composite2),
		"[\"(8,foo)\",\"(42,bar)\"]",
		rangeType,
		npgsqlDbType: null,
		isDefaultForWriting: false);
}