},
		{
			name:          "int64 max positive value",
			in:            hex("1b7fffffffffffffff"), // 9223372036854775807
			want:          int64(9223372036854775807),
			assertOnError: assertNilError,
		},
		{
			name: "max positive integer value supported by cbor: 2^64 - 1",
			in:   hex("1bffffffffffffffff"), // 18446744073709551615

	case 8:
		x = apply(x, 0x7f7f7f7f7f7f7f7f)
	case 16:
		x = apply(x, 0x7fff7fff7fff7fff)
	case 32:
		x = apply(x, 0x7fffffff7fffffff)
	case 64: // == maxPagesPerPhysPage
		x = apply(x, 0x7fffffffffffffff)
	default:
		throw("bad m value")
	}
	// Now, the top bit of each m-aligned group in x is set
	// that group was all zero in the original x.

	// From each group of m bits subtract 1.