var UnitTypes = []UnitType{{
	Units: []Unit{
		{"B", []string{"b", "byte"}, 1},
		{"kB", []string{"kb", "kbyte", "kilobyte"}, float64(1 << 10)},
		{"MB", []string{"mb", "mbyte", "megabyte"}, float64(1 << 20)},
		{"GB", []string{"gb", "gbyte", "gigabyte"}, float64(1 << 30)},
		{"TB", []string{"tb", "tbyte", "terabyte"}, float64(1 << 40)},
		{"PB", []string{"pb", "pbyte", "petabyte"}, float64(1 << 50)},
	},

// If the value passed in is not actually a map, this will panic.
func ByteKeySet[T any](theMap map[byte]T) Byte {
	return Byte(KeySet(theMap))
}

// Insert adds items to the set.
func (s Byte) Insert(items ...byte) Byte {
	return Byte(cast(s).Insert(items...))
}

// Delete removes all items from the set.
func (s Byte) Delete(items ...byte) Byte {
	return Byte(cast(s).Delete(items...))
}

		{"4byte", 4, func(buf []byte) uint64 { return uint64(binary.LittleEndian.Uint32(buf)) }},
		{"8byte", 8, func(buf []byte) uint64 { return binary.LittleEndian.Uint64(buf) }},
	}

	var g [4096]byte
	for _, bm := range benchmarks {
		buf := make([]byte, bm.nbyte)
		b.Run(bm.name, func(b *testing.B) {
			for j := 0; j < b.N; j++ {
				for i := 0; i < 4096; i += bm.nbyte {
					copy(buf[:], g[i:])
					sink += bm.f(buf[:])
				}
			}

	SYS_READ           = 3   // { ssize_t sys_read(int fd, void *buf, size_t nbyte); }
	SYS_WRITE          = 4   // { ssize_t sys_write(int fd, const void *buf, size_t nbyte); }
	SYS_OPEN           = 5   // { int sys_open(const char *path, int flags, ... mode_t mode); }
	SYS_CLOSE          = 6   // { int sys_close(int fd); }
	SYS_GETENTROPY     = 7   // { int sys_getentropy(void *buf, size_t nbyte); }

	MOVOU (CX)(AX*1), X1
	PXOR  X1, X0
	MOVOU X0, (BX)(AX*1)
	ADDQ  $16, AX
	CMPQ  DX, AX
	JNE   loop16b
	RET

	PCALIGN $16
loop_1b:
	SUBQ  $1, DX           // XOR 1byte backwards.
	MOVB  (SI)(DX*1), DI
	MOVB  (CX)(DX*1), AX
	XORB  AX, DI
	MOVB  DI, (BX)(DX*1)
	TESTQ $7, DX           // AND 7 & len, if not zero jump to loop_1b.
	JNZ   loop_1b

	f1 := Filter{
		set: true,
		Prefix: Prefix{
			string: "doc/",
			set:    true,
			Unused: struct{}{},
		},
		ObjectSizeGreaterThan: 100 * humanize.MiByte,
		ObjectSizeLessThan:    100 * humanize.GiByte,
	}
	b, err := xml.Marshal(f1)
	if err != nil {
		t.Fatalf("Failed to marshal %v", f1)
	}
	var f2 Filter
	err = xml.Unmarshal(b, &f2)
	if err != nil {
		t.Fatalf("Failed to unmarshal %s", string(b))

	SYS_FORK                 = 2   // { int|sys||fork(void); }
	SYS_READ                 = 3   // { ssize_t|sys||read(int fd, void *buf, size_t nbyte); }
	SYS_WRITE                = 4   // { ssize_t|sys||write(int fd, const void *buf, size_t nbyte); }
	SYS_OPEN                 = 5   // { int|sys||open(const char *path, int flags, ... mode_t mode); }
	SYS_CLOSE                = 6   // { int|sys||close(int fd); }

	SYS_FORK                 = 2   // { int|sys||fork(void); }
	SYS_READ                 = 3   // { ssize_t|sys||read(int fd, void *buf, size_t nbyte); }
	SYS_WRITE                = 4   // { ssize_t|sys||write(int fd, const void *buf, size_t nbyte); }
	SYS_OPEN                 = 5   // { int|sys||open(const char *path, int flags, ... mode_t mode); }
	SYS_CLOSE                = 6   // { int|sys||close(int fd); }

// be used to recombine characters.  Note that the byte buffer does not hold
// the UTF-8 characters in order.  Only the rune array is maintained in sorted
// order. flush writes the resulting segment to a byte array.
type reorderBuffer struct {
	rune  [maxBufferSize]Properties // Per character info.
	byte  [maxByteBufferSize]byte   // UTF-8 buffer. Referenced by runeInfo.pos.
	nbyte uint8                     // Number or bytes.

    Arrays.fill(b, (byte) 0);
    ByteStreams.readFully(newTestStream(10), b, 0, 0);
    assertThat(b).isEqualTo(new byte[10]);

    Arrays.fill(b, (byte) 0);
    ByteStreams.readFully(newTestStream(10), b, 0, 10);
    assertThat(b).isEqualTo(newPreFilledByteArray(10));

    Arrays.fill(b, (byte) 0);
    ByteStreams.readFully(newTestStream(10), b, 0, 5);