def normalize(string, form=nil)
form ||= @default_normalization_form
codepoints = u_unpack(string)
case form
when :d
reorder_characters(decompose_codepoints(:canonical, codepoints))
when :c
compose_codepoints(reorder_characters(decompose_codepoints(:canonical, codepoints)))
when :kd
reorder_characters(decompose_codepoints(:compatability, codepoints))
when :kc
compose_codepoints(reorder_characters(decompose_codepoints(:compatability, codepoints)))
else
raise ArgumentError, "#{form} is not a valid normalization variant", caller
end.pack('U*')
end