class ActiveSupport::Multibyte::Chars

ActiveSupport::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:

and validations.
considered the best normalization form for passing strings to databases
Returns the KC normalization of the string by default. NFKC is

def normalize(form = nil)
  chars(Unicode.normalize(@wrapped_string, form))
end