t.Errorf("got %q want %q", got, s)
		}
	}
}

var (
	benchEscapeData     = strings.Repeat("AAAAA < BBBBB > CCCCC & DDDDD ' EEEEE \" ", 100)
	benchEscapeNone     = strings.Repeat("AAAAA x BBBBB x CCCCC x DDDDD x EEEEE x ", 100)
	benchUnescapeSparse = strings.Repeat(strings.Repeat("AAAAA x BBBBB x CCCCC x DDDDD x EEEEE x ", 10)+"&amp;", 10)
	benchUnescapeDense  = strings.Repeat("&amp;&lt; &amp; &lt;", 100)
)

//
//	'e'	-d.dddde±dd, decimal exponent, at least two (possibly 0) exponent digits
//	'E'	-d.ddddE±dd, decimal exponent, at least two (possibly 0) exponent digits
//	'f'	-ddddd.dddd, no exponent
//	'g'	like 'e' for large exponents, like 'f' otherwise
//	'G'	like 'E' for large exponents, like 'f' otherwise
//	'x'	-0xd.dddddp±dd, hexadecimal mantissa, decimal power of two exponent

			"aaa\tbbbb\n",

		"本.......b.......c\n" +
			"aa......本本本.....cccc....ddddd\n" +
			"aaa.....bbbb\n",
	},

	{
		"12a",
		8, 0, 1, ' ', AlignRight,
		"a\tè\tc\t\n" +
			"aa\tèèè\tcccc\tddddd\t\n" +
			"aaa\tèèèè\t\n",

		"       a       è       c\n" +
			"      aa     èèè    cccc   ddddd\n" +
			"     aaa    èèèè\n",
	},

	{
		"12b",
		2, 0, 0, ' ', 0,

E	abaa|abbaa|abbbaa|abbbbaa	ababbabbbabbbabbbbabbbbaa	(18,25)
E	abaa|abbaa|abbbaa|abbbbaa	ababbabbbabbbabbbbabaa	(18,22)
E	aaac|aabc|abac|abbc|baac|babc|bbac|bbbc	baaabbbabac	(7,11)
BE$	.*			\x01\xff	(0,2)
E	aaaa|bbbb|cccc|ddddd|eeeeee|fffffff|gggg|hhhh|iiiii|jjjjj|kkkkk|llll		XaaaXbbbXcccXdddXeeeXfffXgggXhhhXiiiXjjjXkkkXlllXcbaXaaaa	(53,57)

	case exp < 100:
		dst = append(dst, byte(exp/10)+'0', byte(exp%10)+'0')
	default:
		dst = append(dst, byte(exp/100)+'0', byte(exp/10)%10+'0', byte(exp%10)+'0')
	}

	return dst
}

// %f: -ddddddd.ddddd
func fmtF(dst []byte, neg bool, d decimalSlice, prec int) []byte {
	// sign
	if neg {
		dst = append(dst, '-')
	}

	// integer, padded with zeros as needed.
	if d.dp > 0 {
		m := min(d.nd, d.dp)

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