func (l *charLobChunkWriter) runeCount(b []byte) int {
	numChars := 0
	for len(b) > 0 {
		_, size := utf8.DecodeRune(b)
		b = b[size:]
		numChars++
		if size == utf8.UTFMax {
			numChars++
		}
	}
	return numChars
}
func (l *charLobChunkWriter) runeCount(b []byte) int {
	numChars := 0
	for len(b) > 0 {
		_, size := utf8.DecodeRune(b)
		b = b[size:]
		numChars++
		if size == utf8.UTFMax {
			numChars++
		}
	}
	return numChars
}
// Caution: hdb counts 4 byte utf-8 encodings (cesu-8 6 bytes) as 2 (3 byte) chars