whatlanguage not exacly recognition return result

[mm580486]

hi guys my sample: wl = WhatLanguage.new(:english, :farsi, :arabic)

wl.language('سلام خوبی') => :farsi

wl.language('سلام خوبی؟') => :arabic

this is farsi/arabic words but not recognition farsi character

wl.language('للللنننن') => nil

and not recognition english/farsi/arabic number

wl.language('۹۹۹') => nil

wl.language('23') => nil