return false
	}
	n := x.sa.len()
	for i := 0; i < n; i++ {
		if x.sa.get(i) != y.sa.get(i) {
			return false
		}
	}
	return true
}

// returns the serialized index size
func testSaveRestore(t *testing.T, tc *testCase, x *Index) int {
	var buf bytes.Buffer
	if err := x.Write(&buf); err != nil {
		t.Errorf("failed writing index %s (%s)", tc.name, err)
	}
	size := buf.Len()
	var y Index