"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,

	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)