// This is an exact count if s is ASCII, otherwise it is an approximation.
	n := 0
	wasSpace := 1
	// setBits is used to track which bits are set in the bytes of s.
	setBits := uint8(0)
	for i := 0; i < len(s); i++ {
		r := s[i]
		setBits |= r
		isSpace := int(asciiSpace[r])
		n += wasSpace & ^isSpace
		wasSpace = isSpace
	}

	if setBits >= utf8.RuneSelf {
		// Some runes in the input slice are not ASCII.

	Value string `json:"value"`

	HiddenIfEmpty bool `json:"-"`
}

func (kv KV) String() string {
	var s strings.Builder
	s.WriteString(kv.Key)
	s.WriteString(KvSeparator)
	spc := madmin.HasSpace(kv.Value)
	if spc {
		s.WriteString(KvDoubleQuote)
	}
	s.WriteString(kv.Value)
	if spc {
		s.WriteString(KvDoubleQuote)
	}
	return s.String()
}