// If it is half of a pair, we will add 3 for the second surrogate
			// (total of 6) and overestimate by 2 bytes for the pair,
			// since the resulting rune only requires 4 bytes.
			maxLen += 3
		}
	}
	buf := decodeWTF16(s, make([]byte, 0, maxLen))
	return unsafe.String(unsafe.SliceData(buf), len(buf))
}

// utf16PtrToString is like UTF16ToString, but takes *uint16
// as a parameter instead of []uint16.