Doesnt work on UTF-8

[emdete]

require 'strong'

function love.draw()
	s = 'läla'
	love.graphics.print(s(4), 10, 10)
end

Gives "l", not 'a' which would be the fourth letter. s(3) even fails with "UTF-8 decoding error: Invalid UTF-8".

Is strong not made for international strings?