ETHERTYPE_CABLETRON               = 0x7034
	ETHERTYPE_CHAOS                   = 0x804
	ETHERTYPE_COMDESIGN               = 0x806c
	ETHERTYPE_COMPUGRAPHIC            = 0x806d
	ETHERTYPE_COUNTERPOINT            = 0x8062
	ETHERTYPE_CRONUS                  = 0x8004
	ETHERTYPE_CRONUSVLN               = 0x8003
	ETHERTYPE_DCA                     = 0x1234
	ETHERTYPE_DDE                     = 0x807b

	{"%x", "a75\n", &uintVal, uint(0xa75)},
	{"%x", "A75\n", &uintVal, uint(0xa75)},
	{"%x", "A7_5\n", &uintVal, uint(0xa7)}, // only %v takes underscores
	{"%U", "U+1234\n", &intVal, int(0x1234)},
	{"%U", "U+4567\n", &uintVal, uint(0x4567)},

	{"%e", "2.3\n", &float64Val, 2.3},
	{"%E", "2.3e1\n", &float32Val, float32(2.3e1)},
	{"%f", "2.3e2\n", &float64Val, 2.3e2},
	{"%g", "2.3p2\n", &float64Val, 2.3 * 4},

off a boolean flag.

Flag parsing stops just before the first non-flag argument
("-" is a non-flag argument) or after the terminator "--".

Integer flags accept 1234, 0664, 0x1234 and may be negative.
Boolean flags may be:

	1, 0, t, f, T, F, true, false, TRUE, FALSE, True, False

Duration flags accept any input valid for time.ParseDuration.

	0x1280: 0x000c, 0x1281: 0x000c,
	0x12a2: 0x000c, 0x12a3: 0x000c,
	0x12a4: 0x000c, 0x12a5: 0x000c, 0x12a8: 0x000c, 0x12a9: 0x000c,
	0x12ab: 0x000c, 0x12ac: 0x000c, 0x12ad: 0x000c,
	// Block 0x4b, offset 0x12c0
	0x12e6: 0x000c, 0x12e8: 0x000c, 0x12e9: 0x000c,
	0x12ed: 0x000c, 0x12ef: 0x000c,
	0x12f0: 0x000c, 0x12f1: 0x000c,
	// Block 0x4c, offset 0x1300
	0x132c: 0x000c, 0x132d: 0x000c, 0x132e: 0x000c, 0x132f: 0x000c,

	0x1242: 0x000c,
	0x126b: 0x000c, 0x126c: 0x000c, 0x126d: 0x000c, 0x126e: 0x000c, 0x126f: 0x000c,
	0x1270: 0x000c, 0x1271: 0x000c, 0x1272: 0x000c, 0x1273: 0x000c,
	// Block 0x4a, offset 0x1280
	0x1280: 0x000c, 0x1281: 0x000c,
	0x12a2: 0x000c, 0x12a3: 0x000c,
	0x12a4: 0x000c, 0x12a5: 0x000c, 0x12a8: 0x000c, 0x12a9: 0x000c,
	0x12ab: 0x000c, 0x12ac: 0x000c, 0x12ad: 0x000c,
	// Block 0x4b, offset 0x12c0

	0x121e: 0xe00d, 0x121f: 0x0008, 0x1220: 0xe00d, 0x1221: 0x0008, 0x1222: 0xe00d, 0x1223: 0x0008,
	0x1224: 0xe00d, 0x1225: 0x0008, 0x1226: 0xe00d, 0x1227: 0x0008, 0x1228: 0xe00d, 0x1229: 0x0008,
	0x122a: 0x6e29, 0x122b: 0x1029, 0x122c: 0x11c1, 0x122d: 0x6e41, 0x122e: 0x1221, 0x122f: 0x0008,
	0x1230: 0x6e59, 0x1231: 0x6e71, 0x1232: 0x1239, 0x1233: 0x444d, 0x1234: 0xe00d, 0x1235: 0x0008,

    assertThat(
      mergeAdjacentRanges(
        listOf(
          Mapping(0x0232, 0x0232, TYPE_MAPPED, "a".encodeUtf8()),
          Mapping(0x0233, 0x0233, TYPE_VALID, ByteString.EMPTY),
          Mapping(0x0234, 0x0236, TYPE_VALID, ByteString.EMPTY),
          Mapping(0x0237, 0x0239, TYPE_VALID, ByteString.EMPTY),
          Mapping(0x023a, 0x023a, TYPE_MAPPED, "b".encodeUtf8()),
        ),
      ),
    ).containsExactly(

		{nbits: 5, value: 11},
		{nbits: 32, value: 0x12345678},
		{nbits: 15, value: 14495},
		{nbits: 3, value: 6},
		{nbits: 6, value: 13},
		{nbits: 1, fail: true},
	}

	rd := bytes.NewReader([]byte{0xab, 0x12, 0x34, 0x56, 0x78, 0x71, 0x3f, 0x8d})
	br := newBitReader(rd)
	for i, v := range vectors {
		val := br.ReadBits(v.nbits)
		if fail := bool(br.err != nil); fail != v.fail {
			if fail {

	0x121e: 0xe00d, 0x121f: 0x0008, 0x1220: 0xe00d, 0x1221: 0x0008, 0x1222: 0xe00d, 0x1223: 0x0008,
	0x1224: 0xe00d, 0x1225: 0x0008, 0x1226: 0xe00d, 0x1227: 0x0008, 0x1228: 0xe00d, 0x1229: 0x0008,
	0x122a: 0x6e29, 0x122b: 0x1029, 0x122c: 0x11c1, 0x122d: 0x6e41, 0x122e: 0x1221, 0x122f: 0x0040,
	0x1230: 0x6e59, 0x1231: 0x6e71, 0x1232: 0x1239, 0x1233: 0x444d, 0x1234: 0xe00d, 0x1235: 0x0008,

	0x121e: 0x67f5, 0x121f: 0x0008, 0x1220: 0x6815, 0x1221: 0x0008, 0x1222: 0x6835, 0x1223: 0x0008,
	0x1224: 0x0008, 0x1225: 0x6855, 0x1226: 0x6875, 0x1227: 0x0008, 0x1228: 0x0008, 0x1229: 0x0008,
	0x122a: 0x6895, 0x122b: 0x68b5, 0x122c: 0x68d5, 0x122d: 0x68f5, 0x122e: 0x6915, 0x122f: 0x6935,
	0x1230: 0x6955, 0x1231: 0x6975, 0x1232: 0x6995, 0x1233: 0x69b5, 0x1234: 0x69d5, 0x1235: 0x69f5,