class Mail::Multibyte::Chars

def normalize(form = nil)

Mail::Multibyte::Unicode.default_normalization_form
:c, :kc, :d, or :kd. Default is
* form - The form you want to normalize in. Should be one of the following:

passing strings to databases and validations.
Returns the KC normalization of the string by default. NFKC is considered the best normalization form for 
def normalize(form = nil)
  chars(Unicode.normalize(@wrapped_string, form))
end