for v := int64(-255); v < 255; v++ {
			s := sevenBitU(v)
			if s == nil {
				continue
			}
			b := AppendUleb128(nil, uint64(v))
			if !reflect.DeepEqual(b, s) {
				t.Errorf("sevenBitU(%d) = %v but AppendUleb128(%d) = %v", v, s, v, b)
			}
		}
	})

	t.Run("signed", func(t *testing.T) {
		for v := int64(-255); v < 255; v++ {
			s := sevenBitS(v)
			if s == nil {
				continue
			}

}

// sevenBitU returns the unsigned LEB128 encoding of v if v is seven bits and nil otherwise.
// The contents of the returned slice must not be modified.
func sevenBitU(v int64) []byte {
	if uint64(v) < uint64(len(sevenbits)) {
		return sevenbits[v : v+1]
	}
	return nil
}

// sevenBitS returns the signed LEB128 encoding of v if v is seven bits and nil otherwise.