# Returns `self` with all characters escaped with their UTF-16 representation
	#
	# ~~~
	# assert "Aèあ𐏓".escape_to_utf16 == "\\u0041\\u00e8\\u3042\\ud800\\udfd3"
	# ~~~
	fun escape_to_utf16: String do
		var buf = new Buffer
		for i in chars do buf.append i.escape_to_utf16
		return buf.to_s
	end