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