Thus <code>3&amp;1&lt;&lt;2</code> is 4, not 0—it parses as <code>(3&amp;1)&lt;&lt;2</code>
not <code>3&amp;(1&lt;&lt;2)</code>.
Also, constants are always evaluated as 64-bit unsigned integers.
Thus <code>-2</code> is not the integer value minus two,
but the unsigned 64-bit integer with the same bit pattern.
The distinction rarely matters but
to avoid ambiguity, division or right shift where the right operand's
high bit is set is rejected.

// byte arrays sized based on width.
func NewBytePoolCap(maxSize uint64, width int, capwidth int) (bp *BytePoolCap) {
	if capwidth <= 0 {
		panic("total buffer capacity must be provided")
	}
	if capwidth < 64 {
		panic("buffer capped with smaller than 64 bytes is not supported")
	}
	if width > capwidth {
		panic("minimum buffer length cannot be > capacity of the buffer")
	}
	return &BytePoolCap{
		c:    make(chan []byte, maxSize),
		w:    width,

			crypto.MetaKeyID:             "kms-key",
			crypto.MetaDataEncryptionKey: "m-key",
		},
		encryptionType: encrypt.S3,
		err:            nil,
	}, // 4
	{
		headers:    http.Header{},
		copySource: true,
		metadata: map[string]string{
			crypto.MetaSealedKeyS3:       base64.StdEncoding.EncodeToString(make([]byte, 64)),
			crypto.MetaKeyID:             "kms-key",

$16, R16; \ MOVD $32, R17; \ MOVD $48, R18; \ MOVD $64, R19; \ LXVD2X (blk_key)(R0), VS0; \ LXVD2X (blk_key)(R16), VS1; \ LXVD2X (blk_key)(R17), VS2; \ LXVD2X (blk_key)(R18), VS3; \ LXVD2X (blk_key)(R19), VS4; \ ADD $64, R16; \ ADD $64, R17; \ ADD $64, R18; \ ADD $64, R19; \ LXVD2X (blk_key)(R16), VS5; \ LXVD2X (blk_key)(R17), VS6; \ LXVD2X (blk_key)(R18), VS7; \ LXVD2X (blk_key)(R19), VS8; \ ADD $64, R16; \ ADD $64, R17; \ ADD $64, R18; \ ADD $64, R19; \ LXVD2X (blk_key)(R16), VS9; \ LXVD2X (blk_key)(R17),...

		{"a", 'ӆ', -1},
		{"  ӆ", 'ӆ', 2},
		{"  a", 'ӆ', -1},
		{strings.Repeat("ц", 64) + "ӆ", 'ӆ', 128}, // test cutover
		{strings.Repeat("ц", 64), 'ӆ', -1},

		// 3 bytes
		{"Ꚁ", 'Ꚁ', 0},
		{"a", 'Ꚁ', -1},
		{"  Ꚁ", 'Ꚁ', 2},
		{"  a", 'Ꚁ', -1},
		{strings.Repeat("Ꙁ", 64) + "Ꚁ", 'Ꚁ', 192}, // test cutover
		{strings.Repeat("Ꙁ", 64) + "Ꚁ", '䚀', -1},  // 'Ꚁ' and '䚀' share the same last two bytes

		// 4 bytes

		return x, nil
	case int64:
		return float64(x), nil
	case string:
		f, err := strconv.ParseFloat(strings.TrimSpace(x), 64)
		if err != nil {
			return 0, errCastFailure("could not parse as float")
		}
		return f, nil
	case []byte:
		f, err := strconv.ParseFloat(strings.TrimSpace(string(x)), 64)
		if err != nil {
			return 0, errCastFailure("could not parse as float")
		}
		return f, nil
	default:

		return sealedKey, errInvalidInternalSealAlgorithm
	}
	encryptedKey, err := base64.StdEncoding.DecodeString(b64SealedKey)
	if err != nil || len(encryptedKey) != 64 {
		return sealedKey, Errorf("The internal sealed key for SSE-C is invalid")
	}

	sealedKey.Algorithm = algorithm
	copy(sealedKey.IV[:], iv)
	copy(sealedKey.Key[:], encryptedKey)
	return sealedKey, nil

	CSLLI	$0, X5					// ERROR "immediate cannot be zero"
	CSLLI	$64, X5					// ERROR "must be in range [0, 63]"
	CSRLI	$63, X10, X11				// ERROR "rd must be the same as rs1"
	CSRLI	$63, X5					// ERROR "expected integer prime register in rd"
	CSRLI	$-1, X10				// ERROR "must be in range [0, 63]"
	CSRLI	$0, X10					// ERROR "immediate cannot be zero"
	CSRLI	$64, X10				// ERROR "must be in range [0, 63]"

			break
		}

		// Manually deserialize the size since AWS specified
		// the chunk size to be of variable width. In particular,
		// a size of 16 is encoded as `10` while a size of 64 KB
		// is `10000`.
		switch {
		case b >= '0' && b <= '9':
			size = size<<4 | int(b-'0')
		case b >= 'a' && b <= 'f':
			size = size<<4 | int(b-('a'-10))
		case b >= 'A' && b <= 'F':

	VSLI	$63, V7.D2, V8.D2               // e8547f6f
	VUSRA	$8, V2.B16, V3.B16              // 4314086f
	VUSRA	$16, V3.H4, V4.H4               // 6414102f
	VUSRA	$32, V5.S4, V6.S4               // a614206f
	VUSRA	$64, V7.D2, V8.D2               // e814406f
	VTBL	V22.B16, [V28.B16, V29.B16], V11.B16                                    // 8b23164e
	VTBL	V18.B8, [V17.B16, V18.B16, V19.B16], V22.B8                             // 3642120e