wantValid:    true,
		wantAligned:  []sparseEntry{{0, 5000}},
		wantInverted: []sparseEntry{{5000, 0}},
	}, {
		in: []sparseEntry{{1000, 4000}}, size: 5000,
		wantValid:    true,
		wantAligned:  []sparseEntry{{1024, 3976}},
		wantInverted: []sparseEntry{{0, 1000}, {5000, 0}},
	}, {
		in: []sparseEntry{{0, 3000}}, size: 5000,
		wantValid:    true,
		wantAligned:  []sparseEntry{{0, 2560}},